请帮我修改作文的语法错误Today was my father's birthday.I decided to give him a surprise,so I went to the shop and bought a gift.Then,I went home by subway train.Had been thing about how happy he was when he received the gift,I was so exci

请帮我修改作文的语法错误Today was my father's birthday.I decided to give him a surprise,so I went to the shop and bought a gift.Then,I went home by subway train.Had been thing about how happy he was when he received the gift,I was so exci
请帮我修改作文的语法错误
Today was my father's birthday.I decided to give him a surprise,so I went to the shop and bought a gift.Then,I went home by subway train.Had been thing about how happy he was when he received the gift,I was so excited that I can hardly sat on my seat silently.At the next stop,got on a grandma,holding two big bags in her hands.She looked very tired.I began thinking to myself whether I should give my seat to her.Then about one minutes passed,I stood up and gave my seat to her."Thank you!"she said.When I heard these words,I felt very happy.I know I had done the right thing.Today was a great day!
这是一篇日记

请帮我修改作文的语法错误Today was my father's birthday.I decided to give him a surprise,so I went to the shop and bought a gift.Then,I went home by subway train.Had been thing about how happy he was when he received the gift,I was so exci
Today was my father's birthday.
Today is my father's birthday.今天是你父亲的生日,这里没必要用过去时.
so I went to the shop and bought a gift.后面可以加for him也可以不加.
Had been thing about how happy he was when he received the gift,
你是想说“你一直在想你的你的父亲收到礼物时会高兴到什么程度”吗?
I kept thinking about how happy he would be(这里应该用过去将来时) when he received the gift.
也可以说
I could not stop thinking about how happy he would be when he received the gift.
could not stop thinking是can't stop doing的一个应用,“禁不住做某事”
I was so excited that I can hardly sat on my seat silently
I was so excited that I could hardly sit on my seat.
At the next stop,got on a grandma,holding two big bags in her hands.
A grandma got on the train,holding two big bags in her hands at the next stop.
I began thinking to myself whether I should give my seat to her.
I start to think whether I should give my seat to her (or not).
也可以用surrender my seat to her.
Then about one minutes passed,I stood up and gave my seat to her.
After one minute's thinking,I stood up and gave my seat to her.

by subway train - on the subway
Had been thing about how happy he was when he received the gift, - All the way home I was imagining how happy he would be when he got the gift
can hardly sat - ...

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by subway train - on the subway
Had been thing about how happy he was when he received the gift, - All the way home I was imagining how happy he would be when he got the gift
can hardly sat - could hardly sit
on my seat silently - in my seat quietly
got on a grandma - an old lady got on the subway
about one minutes passed - after about a minute

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imagining how happy he would be when he got the gift