-I'd like to invite you to my birthday party on Friday evening .-Thank you,but ___I'll have time,I'm not sure at the moment.A if Bwhether Cwhat Dwhich (为什么要选B,不能选A,A和B有什么区别)2.Is Science Museum open to the public yet?Ye
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![-I'd like to invite you to my birthday party on Friday evening .-Thank you,but ___I'll have time,I'm not sure at the moment.A if Bwhether Cwhat Dwhich (为什么要选B,不能选A,A和B有什么区别)2.Is Science Museum open to the public yet?Ye](/uploads/image/z/10544578-34-8.jpg?t=-I%27d+like+to+invite+you+to+my+birthday+party+on+Friday+evening+.-Thank+you%2Cbut+___I%27ll+have+time%2CI%27m+not+sure+at+the+moment.A+if+Bwhether+Cwhat+Dwhich+%EF%BC%88%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E9%80%89B%2C%E4%B8%8D%E8%83%BD%E9%80%89A%2CA%E5%92%8CB%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%892.Is+Science+Museum+open+to+the+public+yet%3FYe)
-I'd like to invite you to my birthday party on Friday evening .-Thank you,but ___I'll have time,I'm not sure at the moment.A if Bwhether Cwhat Dwhich (为什么要选B,不能选A,A和B有什么区别)2.Is Science Museum open to the public yet?Ye
-I'd like to invite you to my birthday party on Friday evening .
-Thank you,but ___I'll have time,I'm not sure at the moment.
A if Bwhether Cwhat Dwhich (为什么要选B,不能选A,A和B有什么区别)
2.Is Science Museum open to the public yet?
Yes,It ___for almost half an hour.
A was open B has opened C has been open D has been opened(为什么要选C?)
-I'd like to invite you to my birthday party on Friday evening .-Thank you,but ___I'll have time,I'm not sure at the moment.A if Bwhether Cwhat Dwhich (为什么要选B,不能选A,A和B有什么区别)2.Is Science Museum open to the public yet?Ye
第一题:在介词后,只能用whether
区别:(1).whether可与or not连用,而if不可以;
(2).在句首时用whether,而不用if;
(3).在介词后用whether,而不用if;
(4).可以与动词不定式连用 He can’t decide whether to visit her or not.他决定不出是否去看她.(5).表示“如果”时用if,而不用whether.
第二题:强调持续的一个状态.