詳細解說
1.“Not for 2 weeks...”是“They are not due back for 2 weeks.”的省略形式。
2.“make sure”意為“查明,確定,設(shè)法確?!?,可以用作不及物動詞,也可以在后面接從句。例如:You must make sure of the time and place.(你必須把時間和地點弄清楚。)You'd better make sure.(你最好確認一下。)We make sure the experiment will be a success.
(我們確定這個實驗會成功。)Make sure that you lock the door when you leave.(你走時務(wù)必要把門鎖上。)此外:“make certain”也可表示此含義。