My uncle said (that) he would come and that he would also bring his son.
★ whether和if都意为“能否”，通常状况下，二者都能够疏导宾语从句；但在介词之后或与or not连用时，只能用whether。留意：当whether与or not不连在一同时，书面语中可用if取代whether，当然也能够用whether。如：
I don't know if / whether there will be trains any more.
They are worrying about whether they can get there in time.
I don't know whether or not I should take his advice.
I'm not sure if / whether the train will arrive on time or not.
We have made it clear that we will learn to deal with various difficult problems.
★ 在第一人称I / we与动词think, expect, believe, guess, suppose等连用，后接宾语从句时，通常将从句的否认转移到主句谓语动词，构成否认前移。如：
I don't suppose you're used to this diet.
★ 可接表语从句的词除系动词be外，还有appear, become, look, remain, seem, sound等连系动词。如：
The boy has remained where you told him to stand for over an hour.
My idea is that this plan should be carried out immediately.
My hometown is no longer what it used to be.
The question is whether your uncle will offer help to us.
Tom: Hi, Jane. I want to become a scientist. My question is 1. ________ scientists work and 2. ________ I need to do in order to become a scientist. First of all, I'd like to know how long I have to study to become a scientist.
Jane: Well, that depends. Usually, a scientist must have at least a Bachelor's degree, so that means about four years in college. Nowadays, most scientists need a Master's degree, too.
Tom: My second question is 3. ________ courses or major should I choose.
Jane: Again, that depends on 4. ________ you want to study in the future. You will need to study maths and you should take at least a few courses in all the branches of science. If you want to be a successful scientist, you must understand the basics of physics, chemistry and biology.
Tom: Wow, that's a lot. Could you tell me 5. ________ I decide which branch of science I should choose?
Jane: Well, I think the best way is 6. ________ you should get some practical experience. Visit scientists and laboratories to see what the life of a scientist is like. Ask scientists to tell you about their work. You should also try to find out 7. ________ branch of science you like and are good at.
Tom: I like physics, but I don't know 8. ________ my parents will allow me to major in it.
Jane: That's unbelievable. My first advice is 9. ________ you should make your own decision.
Tom: I think so. Do you have any other advice for me?
Jane: Yes. I think a good scientist should be careful, curious and creative and 10. ________ he or she should like to ask a lot of questions and solve problems.
1. how 2. what 3. what 4. what
5. how 6. that 7. which
8. whether / if 9. that 10. that