You should say "Thank you"when someone passes you the salt on the table,when someone walking beforeyou keep the door open for you,when someone says you have done your work well,you have bought a nice thing,or your city is very beautiful.（1~2）1.

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You should say "Thank you"when someone passes you the salt on the table,when someone walking beforeyou keep the door open for you,when someone says you have done your work well,you have bought a nice thing,or your city is very beautiful.（1~2）1.
You should say "Thank you"when someone passes you the salt on the table,when someone walking before
you keep the door open for you,when someone says you have done your work well,you have bought a nice thing,or your city is very beautiful.（1~2）
1.为什么when someone says 中用says而不用saying,况且上文也有when someone walking before you keep the door open for you
（难道是句中的before 可是都是介词后的动词加ing呀）
2.为什么when someone walking before you keep the door open for you中要用keep而不用keeping,句子中不是有before吗
3.Have your parents flown to Shanghai?
Yes.They went there to see the fashion show.
问句中为什么用现在完成时,答句中用过去时.

You should say "Thank you"when someone passes you the salt on the table,when someone walking beforeyou keep the door open for you,when someone says you have done your work well,you have bought a nice thing,or your city is very beautiful.（1~2）1.
1.句中的时态是一般现在时,when引导时间状语从句,在时间状语从句中将来时态都要用现在时代替；
2.when someone walking before you 中”walking before you“是修饰someone的,意思是“走在你前面的人”,强调状态,所以是进行时态,walk并不是谓语,而keep才是someone的谓语,是不是忘了加"s”了.所以要耐心的分清句子结构,不然就搞混了.
3.问句强调到了没有,在答句中其实是做了相应的回答的,完整的应该是yes,they have.说明我的父母已经到过上海了.后面一句是一般过去时,表达另外一个意思,说明他们当时去那里的目的,所以是一般现在时.
希望以上的能帮到你!

用says，keep是表示一般情况，通常状态下，惯例的意思。
用walking意指当...的时候。
你父母已经去上海了吗？（走了吗？问状态）
走了，回答的是动作，过去发生的事

1.when someone walking before 做的的伴随性状语用ing 形式。
when someone says 则不一样。

you should say是什么意思 You should say who are you!是什么意思 You should go ahead and say I LOVE YOU more than Ican say Love you more than say can not You probably know you should saypleaseahdthank you More Than You Should Know 歌词 You should work ________(hard) than before. You should be __(polite)than before You should say you're sorry.问问我忘了 If you hurt someone's feeling ,you should say You should say ____ to others when you see them. You should say sorry since you are wrong Since you are wrong,you should say sorry 两句都一样吗. you know I love you more than I can say. how should I answer theb phone?you should() A.say,”Good-bye B.SAY,”Excue me. C.say,“hello 翻译You should not say you feel very tired ,but should say you feel like a new man you should never take more than you give 连词成句：friends to hello my you say should (.)