If he should fail,he would kill himself.为什么用should ,不是should用于第一人称吗?

If he should fail,he would kill himself.为什么用should ,不是should用于第一人称吗? If Bobby doesn't work hard, he 'll fail the exam保持愿意_____Bobby_____hard,he'll fail the exam if he is not r____,he may fail to pass the test What if you should fail? 怎么回答? should he fail in this esam,he would very sad?I do not this word is mean i am surprise that he ( ) in the exam,为什么不用should fail 而用 should have failed He will fail if he doesn't work hard at his lessons同义He won't ___ ___ he works hard at his lessons. __ he fail to come over,what could we do without him?For you see,we don't have the key to the lab!A If B should C Whether D unless We should perform a_____ in class.根据句意和首字母完成单词.Are you a___ all night?You seem s___.He felt s___ to see his wife in the stange city.I p___ him yester afternoon,but he was out.If he is not r___,he may fail to pass the test.To b I'll be very glad_____ to the lecture this afternoon.A.if he will comeB.if he comesC.if he should comeD.if he had come If he not love me,how should I do? he worked harder only _________(fail) again he's doesn'n know if he should bring a present 翻译 he doesnt know if he should bring a p to his friend's birthday party he should be careful if he goes climbing 为什clinb加ing he ____the test again,in which case ,his mother will be very disappointedA might fail B must have been C should fail D could have fail 为什么选A,which case If he_____(not be)careful,he will fail in the game.该填什么,并给理由 Try as he may,he might fail as well.