V: Give the correct tenses of the verbs: 13/ He was reading the novel when I (call) …………………………him. 14/ She sometimes ( help) ………………………..her mother in the kitchen. 15/ Tomorrow I (meet)……… an old friend who just (come) ………………….. back from Africa. 16/ Please be quite. I (try)………………………….. to concentrate. 17. Gene (eat)____________ dinner when his friend called. 18. He (go)_______________ to that book shop tomorrow. 19/ Why he (not/come)………………………… to my party last night? 20. Lan (drink)_____________ two bottles of water every day. Giúp mình với ạ

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