• Ann often plays tennis.
• I work in a bank, but I don't enjoy it much.
• Do you like parties?
• It doesn't rain so much in summer.

• 'Where's Ann?'  'She's playing tennis.'
• Please don't disturb me now. I'm working.
• Hello. Are you enjoying the party?
• It isn't raining at the moment.

• Ann has played tennis many times.
• I've lost my key. Have you seen it anywhere?
• How long have you and Sam known each other?
• A: Is it still raining?
  B: No, it has stopped.
• The house is dirty. I haven't cleaned it for weeks.

• Ann is tired. She has been playing tennis.
• You're out of breath. Have you been running?
• How long have you been learning English?
• It's still raining. It has been raining all day.
• I haven't been feeling well recently. Perhaps I should go to the doctor.

• Ann played tennis yesterday afternoon.
• I lost my key a few days ago.
• There was a film on TV last night, but we didn't watch it.
• What did you do when you finished work yesterday?

• I saw Ann at the sports centre yesterday. She was playing tennis.
• I dropped my key when I was trying to open the door.
• The television was on, but we weren't watching it.
• What were you doing at this time yesterday?

• It wasn't her first game of tennis. She had played many times before.
• They couldn't get into the house because they had lost the key.
• The house was dirty because I hadn't cleaned it for weeks.

• Ann was tired yesterday evening because she had been playing tennis in the afternoon.
• James decided to go to the doctor because he hadn't been feeling well.

For the passive, see Units 42-44.