A. Adjective → Adverb
He ate his dinner very quickly.
Suddenly the shelf fell down.
adjective + -ly → adverb
• quick → quickly
• careful → carefully
• bad → badly
• sudden → suddenly
• heavy → heavily etc.
Spelling (→ Appendix 5): easy → easily, heavy → heavily
B. Adverbs tell you how something happens or how somebody does something
It's raining heavily.
• The train stopped suddenly.
• I opened the door slowly.
• Please listen carefully.
• I understand you perfectly.
Compare:
adjective (→ Unit 84)
• Sue is very quiet.
• Be careful!
• It was a bad game.
• I feel nervous. (= I am nervous)
adverb
• Sue speaks very quietly. (not 'speaks very quiet')
• Listen carefully! (not 'listen careful')
• Our team played badly. (not 'played bad')
• I waited nervously.
C. hard / fast / late / early
• Sue's job is very hard.
• Ben is a fast runner.
• The bus was late/early.
• Sue works very hard. (not 'hardly')
• Ben can run fast.
• I went to bed late/early.
D. good (adjective) → well (adverb)
• Your English is very good.
• It was a good game.
• You speak English very well. (not 'very good')
• Our team played well.
But well is also an adjective (= not ill, in good health):
• 'How are you?' 'I'm very well, thank you. And you?'
Adjective → Adverb
quick → quickly
careful → carefully
bad → badly
sudden → suddenly
Adverbs of manner
He speaks slowly. → She drives carefully.
They work hard. → We waited patiently.
hard / fast / late / early
He works hard. → She runs fast.
I went to bed late. → The train arrived early.
good → well
You speak English well. → She plays tennis well.
He did the test well. → They played well.