after all畢竟
. You should forgive him for his forgetfulness; after all, he is over seventy.
你應(yīng)該原諒他的健忘癥,畢竟他已經(jīng)七十多歲了.

2. You should be charitable with him; he is a child after all.
你應(yīng)該對他寬容些,畢竟他還是個孩子.
3 Don't blame him for breaking that vase; after all he is a child.
別怪他打碎那個花瓶, 他畢竟是小孩子嘛.
only if:
只有當(dāng)(只是在...的時候)
1. The company will succeed only if it have sufficient backing.
只有當(dāng)該公司獲得足夠的資助,它才會成功.

2. A compound proposition that has components joined by the word and or its symbol and is true only if both or all the components are true.
綜合命題由和或其符號所連接的子句組成的復(fù)合命題,只有當(dāng)所有子句為真時,該句才為真

3. I can buy the house only if a mortgage for 2000 dollars is available.
只有拿到兩千美元的抵押貸款,我才買得起那棟房子.