1.should可表示惋惜、憂慮、歡欣、驚訝等感情色彩以及婉轉語氣。
Its a pity that she leave so soon. 很可惜,她很快就要離開了。(惋惜)
They were worried that their motherland should be in such great danger.他們因祖國處在如此巨大的危險中而感到憂慮。(憂慮)
It is unbelievable that my brother should be working so hard.難以置信,我弟弟工作竟然如此努力。(驚訝)
I should think your answer is correct. 我想你的答案該是對的吧。(婉轉)
2.would可用于委婉的陳述、客氣的請求和委婉的建議。
I don’t think he would be so careless. 我認為他不會那么粗心。
Would you like to come to my birthday party? 你想來參加我的生日聚會嗎?
3.dare可表示“膽敢”。
I dare not say such rude things.我不敢說粗話。
4.need可表示“需要”。
Need I finish the task this afternoon? 我今天下午要完成任務嗎?
Tom, you needn’t worry too much. 湯姆,沒必要這么擔心。
這里借用一下網友總結的記憶口訣:
動詞原形接后面,說話語氣較委婉。
can 能力may許可,must責任或義務。
否定回答needn’t換,需要need, dare敢。
should應該,would愿,have to被迫表客觀。