【正文】
hat。劃橫線的短語的句子成分是 狀語,修飾動詞 realized。 be able to可以用于各種時態(tài)。 c. 表示過去某時刻動作時。 注意: could有時不表示過去時態(tài) : a.提出委婉的請求,(注意在回答中不可用 could)。 3. 表示推測 , 可能性 可用 may, can, must。 4. 表示責任義務(wù),或提出自己的建議 “應(yīng)該 ”用 should, ought to(語氣比 should強), “必須 ”用 must (強調(diào)主觀因素)或 have to (強調(diào)客觀因素 ) Exercises: 用適當?shù)那閼B(tài)動詞填空 [ 1. You _______ work harder if you want to succeed. 2. ____ I have some more tea? 3. Where _____ it be? It ______ be in your desk. 4. Who _____ it be? It _______ not be the headmaster for he is now attending a meeting. 5. I ______ read English very fluently. 6. He __________ swim across the channel when was only 12. 7. It ______ rain at any moment. 8. Listen! It _____ be Mother back. Let’s hurry up. 9. —What should I do? —I think you ________ read more books about your study. 10. It _____ not be him, but I am not sure.