At, on, in usage

On
Used to express a surface of something:

• I put an egg on the kitchen table.
• The paper is on my desk.

Used to specify days and dates:

• The garbage truck comes on Wednesdays.
• I was born on the 14th day of June in 1988.

Used to indicate a device or machine, such as a phone or computer:

• He is on the phone right now.
• She has been on the computer since this morning.
• My favorite movie will be on TV tonight.

Used to indicate a part of the body:

• The stick hit me on my shoulder.
• He kissed me on my cheek.
• I wear a ring on my finger.

Used to indicate the state of something:

• Everything in this store is on sale.
• The building is on fire.

At

Used to point out specific time:

• I will meet you at 12 p.m.
• The bus will stop here at 5:45 p.m.

Used to indicate a place:

• There is a party at the club house.
• There were hundreds of people at the park.
• We saw a baseball game at the stadium.

Used to indicate an email address:

• Please email me at abc@defg.com.

Used to indicate an activity:

• He laughed at my acting.
• I am good at drawing a portrait.

In

Used for unspecific times during a day, month, season, year:

• She always reads newspapers in the morning.
• In the summer, we have a rainy season for three weeks.
• The new semester will start in March.

Used to indicate a location or place:

• She looked me directly in the eyes.
• I am currently staying in a hotel.
• My hometown is Los Angeles, which is in California.

Used to indicate a shape, color, or size:

• This painting is mostly in blue.
• The students stood in a circle.
• This jacket comes in four different sizes.

Used to express while doing something:

• In preparing for the final report, we revised the tone three times.
• A catch phrase needs to be impressive in marketing a product.

Used to indicate a belief, opinion, interest, or feeling:

• I believe in the next life.
• We are not interested in gambling.

AT
specific time	at 5:00	See you at 5:00!
	at 12:30	The meeting starts at 12:30.
	at noon	We serve lunch at noon.
	at midnight	I’ll be asleep at midnight!
(expressions)	at the moment	She’s busy at the moment.
	at the same time	Both flights arrived at the same time.
	at this time	We have no positions available at this time.
	at that time	At that time, they were in Rome.
	at some point	At some point, he’ll complete his PhD.
	at any time	Don’t call my cell at any time.
	at sunrise	The air is so clean at sunrise.
	at sunset	I love walking by the beach at sunset.
	at lunchtime	The café was crowded at lunchtime.
	at dinnertime	We’ll talk about it at dinnertime.
	at suppertime	The kids will be back home at suppertime.
	at night	By the way, Jack called at night.

ON
one day	on Monday	The concert is on Friday.
one date	on Jan 5th	I’m seeing my dentist on May 10th.
repetitive days	Tuesdays	My yoga class is on Tuesdays.
	on Independence Day	I love watching the fireworks on Independence Day!
	on your birthday	What did you do on your birthday?
	on their anniversary	He gave her a gold necklace on their anniversary.
one day + time of day	on Monday morning	Do we have a class on Monday morning?
	on Tuesday afternoon	We last spoke on Tuesday afternoon.
	on Friday evening	On Friday evening, we usually go out for dinner.
	on Thursday night	Where did you go on Thursday night?
(expressions)	on time	We made it to the exam on time.
	on the dot	The organizers started the conference on the dot.
	on the hour	The clock chimes on the hour.

IN
months	in July	They’re getting married in July.
seasons	in summer in the summer	The kids love playing outside in summer. We go camping in the summer.
years	in 2005	They moved to London in 2005.
centuries	in the 1700s	Alaska was discovered in the 1700s.
long periods	in the Middle Ages	The printing press was invented in the Middle Ages.
(expressions)	in the past	In the past, I used to drive to work.
	in the future	In the future, I’ll buy a house.
	in a few days	She’ll be back in a few days.
	in five minutes	He’s going to call back in five minutes.
	in the morning	I woke up early in the morning.
	in the afternoon	Does she sleep in the afternoon?
	in the evening	I’m going to the library in the evening.

NO PREPOSITION
	last	Last Friday, we were in London.
	next	I have a doctor’s appointment next week.
	this	He’s coming over this Thursday.
	every	We watch TV every night.
	today	Today is a brand new day.
	tomorrow	Sorry, I can’t meet you tomorrow.
	the day before yesterday	She was in the hospital the day before yesterday.
	the day after tomorrow	We’re flying to Mexico the day after tomorrow.
	soon	See you soon!
	later	Call me later!
	recently	Recently, my eyes have been bothering me.
	nowadays	Nowadays, he’s kind of depressed.
	as we speak	They’re getting married, as we speak!
	long ago	I knew someone like that long ago.
	a week ago	We signed the deal a week ago.
	a year from now	I’m not sure where I’ll be a year from now.

https://www.engvid.com/english-resource/50-expressions-using-at-on-and-in-prepositions-of-time/

Phrasal verbs

Get up:
If you are lying down and some one says: Get up means stand up or stand.
 Nice getup - I like what are you wareing.

Get away:

to leave or escape from a person or place, often when it is difficult to do this:

We walked to the next beach to get away from the crowds.

I'll get away from work as soon as I can.

• I had to get away from the party. It was awful.
• They got away from burning carbefore it exploded.
• I finally got away from work at eight o'clock.

Types of Injuries

1. Sprain: a sudden or violent twist or wrench of a joint with stretching or tearing of ligaments

2. Fracture: he breaking of hard tissue (such as bone)

3. Whiplash: injury caused by a severe jerk to the head, typically in a car accident

4. Cut: a long, narrow incision in the skin made by something sharp

5. Graze: a slight injury where the skin is scraped

6. Bruise: an injury which appears as a purple mark on your body, although the skin is not broken.

7. Sunburn: a condition in which your skin is sore and red because you have spent too long in the strong heat of the sun

8. Splinter: when a small needle-like particle enters into the body

9. Bite: a wound inflicted by a snake, insect, or spider.

10. Burn: an injury caused by exposure to heat or flame.

11. Sting: when an insect, plant, or animal hurts (someone) by piercing the skin with a sharp, pointed part that usually contains poison

12. Blister: a painful swelling on the skin that contains liquid, caused usually by continuous rubbing, especially on your foot, or by burning

Traffic signs

1. Stop (நிற்க)
2.  No Entry (செல்ல அனுமதியில்லை)
3. Give Away (வழி விடவும்)
4. One-way traffic (ஒருவழிப் பாதை)
5. No straight ahead(நேரான பாதை அடுத்து இல்லை)
6. No vehicles in both directions (இருவழியாகவும் எந்த வாகனமும் இல்லை)
7. All motor vehicles prohibited (அனைத்து வகை வாகனங்களுக்கும் தடை)
8. No Motorcycles (இருசக்கர வாகனங்களுக்கு அனுமதியில்லை)
9. No Bicycles (மிதிவண்டிக்கு அனுமதியில்லை)
10. No Pedestrians (பாதசாரிகளுக்கு அனுமதியில்லை)
11. No Heavy vehicles (கனரக வாகனங்களுக்கு அனுமதியில்லை)
12. No left turn (இடது பக்கம் திரும்பக்கூடாது)
13. No right turn (வலது பக்கம் திரும்பக்கூடாது)
14. No U-turn (யு வளைவு கூடாது)
15. No overtaking (முந்திச் செல்லக்கூடாது)
16. Speed limit (வேக எல்லை)
17. Weight limit (எடை எல்லை)
18. Length Limit (நீள எல்லை)
19. Height Limit (உயர எல்லை)
20. No parking (வாகனம் நிறுத்தக்கூடாது)
21. Horn Prohibited (ஒலி எழுப்பக்கூடாது)
22. No bullock carts (மாட்டு வண்டிக்கு அனுமதியில்லை)
23. Left curve (இடதுபக்க வளைவு)
24. RIght curve(வலது பக்க வளைவு)
25. Roundabout ahead (ரவுண்டானா)
26. Traffic signals ahead(போக்குவரத்து சமிக்ஞைகள் உள்ளன)
27. Level crossing with Barrier ahead(தடுப்பு உள்ள தொடர்வண்டிப் பாதை)
28. Level crossing without Barrier ahead(தடுப்பற்ற தொடர்வண்டிப் பாதை)
29. Uneven road  (சமமற்ற சாலை)
30. Narrow Bridge (குறுகலான பாலம்)

Usage of did, were, was

When+ auxiliary verb+ subject + present verb + extension

When did you work in Chennai?

When+ auxiliary verb+ subject + extension

When were you in Chennai?

When was he in Chennai?

What usage

Do what I say.

I did what he said.

Do you understand what I say.

Do you understand what I said.

What do you say?

What did you say?

What will you say?

See, look, watch

See
On the way, I saw my old friend.

I'm going to see the doctor.

Look
Look at there, it's flying.

Look at me.

She looking at the mirror.

Whatch
I'm watching a movie.

I watched them for a long time.