Put the verbs in the correct tense.?

1.Fung Yuk (wear) this blue dress before, hasn't she?
has worn – 配合附加問句:附加問句的助動詞, 要配合前面的動詞而定...肯定/否定改成相反
2. We all knew that he (lie/欺騙) before.
Lied – 配合knew – 知道為過去式 – 所知道的事自然也是過去式
3. Ka-kit (be) very busy since the opening of his new shop.
has been 用現在完成式:行為發生在過去(有過去時間或過去事件)而持續到現在或繼續 – 本句過去之事件為:the opening of his new shop – 狀態持續到現在或繼續
4. Mr.Chan (not pay) the bill since September.
Has not paid 用現在完成式 – 本句過去時點為September– 狀態持續到現在或繼續
5. She (not eat) any rice since she got well.
Has not eaten -- 用現在完成式 – 本句過去事件為:got well – 狀態持續到現在或繼續
6. Can you see the dwarf (stand) on the giant's shoulders?
Stand – 感官動詞後之事實描述用原型動詞