My friend told me to buy an ice cream? > Did my friend tell him to buy an ice cream?

[dwni1]

I need to know if the structure of the sentence remains the same in English when we ask questions, use modal verbs and so on.
For example, I have two sentences.
1My friend told me to buy him ice cream.
2 My friend thinks that I bought him ice cream.
Can I ask questions and use modal verbs at the begining of these sentences?
For instance,
1 Did my friend tell me to buy him ice cream?
2 Does my friend think that I bought him ice cream?
3 My friend might think that I bought him ice cream.
4 My friend might tell me to buy him ice cream?

 

[Tarheel]

All those sentences are okay, but the last one shouldn't have a question mark.

You seem to be covering a lot of territory. Could you narrow things down a bit?

 

[emsr2d2]

If you want to make the last one a question, you need to change the word order.

Might my friend tell me to buy him an ice cream?

 

[dwni1]

in my opinion, the structure of the sentence remains the same apart from the inversions when asking questions. Does not it?
And we add the modal verb. The rest of the sentence stays the same. Is that right?

 

[emsr2d2]

In my opinion, the structure of the sentence remains the same apart from the inversions when asking questions, doesn't it? Does not it?

This isn't about opinion. It's about facts.

And We add the modal verb. The rest of the sentence stays the same. Is that right?

In the examples you gave, the rest of the words remain the same, albeit in a different order.

 

[Piscean]

in my opinion, the structure of the sentence remains the same apart from the inversions when asking questions. Does not it?

... questions, does it not? (Very formal.)
... questions, doesn't it? (Normal.)