A. Read the following text and look at the underlined verbs:
Present Perfect expresses the completion of an action by Now. Therefore it is, strictly, a kind of present tense because (a) you are not emphasizing When the action took place; (b) you are only interested in the present state of completion; i.e., its effect on events Now.
So this tense must never be used if we state or suggest a definite time in the past. Now, look at the following sentences and fill in the blanks with verbs with appropriate forms of the present perfect:
B. Now use appropriate verbs in the blanks of the following dialogues:
C. Write some sentences about your activities you have done since morning. Show your sentences to your partner to check. You may start like this.
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