I am thinking about whether we should go on a trip.请问这里的whether可以换成if 为什么?

i am thinking about how to make Tom happy.同义句转换i am thinking about how to make Tom happy.i am thinking about how to ( )( )Tom. I am thinking about the future,中文是什么 I am thinking of known more about this play 意思 what am i thinking? Now I am thinking about what I need to do tomorrow.为什么加个about? i am because i know i been thinking of you or not forgetting about you 急I am thinking about which sweater i should buy=Iam thinking aboutwhich sweater _ _. 同义句转换 I’m thinking about what I am going to say. 如果说I am thinking是我在考虑的话,那是不是应该I am thinking about或者I am thinking of呢?可不可以这样说,当think用于现在进行时时,必须后面有about或者of? what am I thinking 还是what I am thinking I am thinking of you I am thinking of you i am thinking of you i am thinking about what to wear today .改为同义句 I am thinking about flying to Shanghai rather than___ there by train.A go B going I am thinking ___ the old days in the country.空里填about还是of 为什么? I am thinking about sending some flowers to my mothersending some flowers to my mother画线 i am not happy you always thinking about me 什么意思啊