1.Look at the sentences in the table. Complete the rules with the words in the box.
Since. How long. For.
A) We use .... + present perfect to ask about the duration of the time.
B) We use.... to talk about a period of time.
C) We use ... to talk about a point in time.
2. Complete the sentences with the correct form of the verbs in brackets. Use the present perfect.
A) They ... (not recycle
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