1. Adverb of Frequency

2. Adverbs of frequency are often placed at the beginning of a sentence.
Example: Sometimes, he likes to go to museums.
Adverbs of frequency follow - come after - the verb 'to be'.
Example: He is sometimes late for work.
Adverbs of frequency (always, never, sometimes, often) usually come before the main verb
Example: Do you always eat in a restaurant? They don't usually travel on Fridays.

3. Rewrite those sentences using the adverbs (in bracket)
They go to the movies. (often)
She listens to classical music. (rarely)
He reads the newspaper. (sometimes)
Sara smiles. (never)
She complains about her husband. (always)
I drink coffee. (sometimes)
Frank is ill. (often)
He feels terrible (usually) 
I go jogging in the morning. (always)
She helps her daughter with her homework. (never)
We watch television in the evening. (always)
I smoke. (never)
I eat meat. (seldom)
I eat vegetables and fruits. (always)