Question

11．我們不確定那些練習(xí)能否按時(shí)完成．（be not sure whether…）We are not sure whether those exersises can be finished on time．．

Answer 1

分析 We are not sure whether those exersises can be finished on time．

解答 答案：We are not sure whether those exersises can be finished on time．表達(dá)的是客觀事實(shí)用一般現(xiàn)在時(shí)，表示不確定…用所給的be not sure whether…，主語we復(fù)數(shù)，故are，whether引導(dǎo)的賓語從句，后加陳述句語序，主語those exersises是動(dòng)詞finish的承受者，結(jié)合情態(tài)動(dòng)詞can能，用情態(tài)動(dòng)詞的被動(dòng)語態(tài)---情態(tài)動(dòng)詞+be+過去分詞，on time準(zhǔn)時(shí)，故答案是We are not sure whether those exersises can be finished on time．

點(diǎn)評 be sure+賓語從句，表示主句主語對賓語從句中涉及的事物所作出的判斷，意為"確信某事一定會(huì)…"．例如：
I'm not sure whether I've met him before．我不能確定以前是否見到過他． 
We are sure he will make great progress this term．我們確信他這學(xué)期一定會(huì)取得巨大進(jìn)步