🔗3. Free and Freely

When used after a verb, the adverb free means without payment.

◇Buy two shirts and get one free.
◇Can I eat free in your restaurant?

Freely means without limit or restriction.
◇Speak freely.

🔗4. Hard and Hardly

The adverb hard means heavily, severely or with difficulty.
◇You must work hard.

Hardly means almost not.
◇I have hardly any money left.

🔗5. Late and Lately

The adverb late has a similar meaning to the adjective late.
Lately means a short time ago and recently.
◇We will be late for dinner.
◇It is getting late.
◇I have not read anything lately.

🔗6. Most and Mostly

Most is the superlative of much. It is used to form superlative adjectives and adverbs.
◇Those who have the most money are not always the happiest.
◇What pleased me most was his helping nature.

In a formal style, most can mean very.
◇This is a most (=very) interesting book.

Mostly means chiefly, generally or in most cases.
◇My friends are mostly non-smokers.

🔗7. Real and Really

In informal American English, real is often used before adjectives and adverbs. It means the same as really.
◇That was real nice. (=really nice)
◇She sings real well. (=really well)

🔗8. Sure and Surely

In an informal style, sure is often used to mean certainly. This is common in American English.

‘Can I borrow your bicycle?’ ‘Sure.’

surely used to show that you think something must be true, especially when people seem to be disagreeing with you:

◇ Surely we can’t just stand back and let this happen?

Use "on" for large vehicles which you can stand and walk around in, (a bus, an airplane, a train, a metro/subway car, a cruise ship, a boat).

Use "in" for (usually) smaller vehicles or crafts that you have to enter and sit in, (a car, a taxi, a truck, a helicopter, a canoe, a kayak, a small boat, a carriage, a rickshaw).