[Grammar] I think she must have not trusted me.

[sania-baharat]

Are these two sentences correct?

When I reached her, I stopped briefly to pick her up. I asked her to get in the car, but she refused. I think that she must have not trusted me.

When I reached her, I stopped briefly to pick her up. I asked her to get in the car, but she refused. I though that she must not trusted me.

 

[Tarheel]

Are these two sentences correct?

When I reached her, I stopped briefly to pick her up. I asked her to get in the car, but she refused. I think that she must not have trusted me.

That one.

 

[sania-baharat]

When I reached her, I stopped briefly to pick her up. I asked her to get in the car, but she refused. I though that she must not trusted me.

May I ask why the sentence above is wrong when we can have the following:

I think I should have helped her.
I thought that I should help her.

 

[Matthew Wai]

'Must not trusted' is ungrammatical.
'Must have not trusted' is grammatical and refers to the past.

 

[GoesStation]

May I ask why the sentence above is wrong when we can have the following:

I think I should have helped her.
I thought that I should help her.

Must is a modal verb which can only be followed by a bare infinitive or a conjugation that begins with a bare infinitive.

 

[sania-baharat]

Oh! What a MISTAKE! Reading too many materials on Must made me confused. Thank you all.

Is the following correct now?

When I reached her, I stopped briefly to pick her up. I asked her to get in the car, but she refused. I though that she must not trust me.

 

[Matthew Wai]

I thought she did not trust me.

 

[Rover_KE]

I thought that she must not trust me.

1

 

[Tdol]

I thought she did not trust me.

This is more likely to me.

 

[GoesStation]

I thought [that] she must not trust me works fine for my American English ears. We usually would omit ​that.