現(xiàn)在：
1.If I were you,I would take an umbrella.如果我是你,我會(huì)帶把傘.（事實(shí)：我不可能是你）
2.If I knew his telephone number,I would tell you.如果我知道他的電話(huà)號(hào)碼,我就會(huì)告訴你.（事實(shí)：不知道）
3 If I were you,I'd like to go home
如果我是你,我會(huì)選擇回家
4 If there was't the U.S.A,I would choose Australia.
如果沒(méi)有美國(guó)的話(huà),我就會(huì)選擇澳大利亞.
過(guò)去：
1 1.If I had got there earlier,I should/could have met her.如果我早到那兒,我就會(huì)見(jiàn)到她.（事實(shí)：去晚了）
2.If he had taken my advice,he would not have made such a mistake.如果他聽(tīng)我的勸告的話(huà),就不會(huì)犯這樣的錯(cuò)誤了.（事實(shí)：沒(méi)有聽(tīng)我的話(huà)）
將來(lái)：
1.If he should come here tomorrow,I should/would talk to him.如果他哪天來(lái)這兒的話(huà),我就跟他談?wù)?（事實(shí)：來(lái)的可能性很?。?
2.If there were a heavy snow next Sunday,we would not go skating.如果下周日下大雪,我們就不能去滑冰了.（事實(shí)：不知能否下雪）