27 Tense Revision (Present, Past, Present Perfect) .

6 He (write) a lot of letters yesterday.
7 We (not play) tennis together since last May.
8I (go) away last weekend. .
9 You (see) my fountain-pen? I (lose) it.
10 I (learn) English for the last two years, and now I (study) Russian, too.
When water (boil) the liquid (change) to a vapour that (be called) steam.
12 He (study) chemistry for three years and then (give) it up.
13 Cyril never (wash) behind his ears; he (say) the soap (get) into his eyes.
14 Maisie (paint) her toe-nails and her hair (change) colour at least three times since last winter.
15 My wife (not come) home yet. She never (come) home before midnight and last night she (not get) in till two o'clock.
16 At present he (read) an English novel; it is the third English novel he (read) this year.
17 When your train (leave)? You (pack) your bags yet? Here are some sandwiches I (make) you for the journey.
18 She never (see) the sea. She (want) to go last year but she (have) no money.
19 'You (speak) to my sister yesterday?' 'No, I (not see) her for a long time. I (can) not remember when I last (see) her.'
20 While I (walk) through the park with Maisie last night, a man (snatch) her bag from her hand and (run) away. I (can) not run after him because it (be) too dark to leave her alone. The police (not catch) him yet.​