Difference between "seems like, as if, appears to be"

[Adonistalavera]

Greetings to all members:
How to use the following Phrases (Differentiates).
For example:
" It seems like they are having a trouble to take the exam."
" The Questionaires appear to be difficult why most of the students are having trouble to take the exam.
" As if the students don't want to take the exam because the questionaires were so difficult.
I need your comments fellow members. Please, correct me if they aren't in the proper grammar.
Thank you for your immediate response.

[Kitosdad]

" It seems like they are having a trouble to take the exam."

" It appears that they are having some difficulties taking the exam."


" The Questionaires appear to be difficult why most of the students are having trouble to take the exam.

" Most of the students seem to be having problems with the difficult questions."


" As if the students don't want to take the exam because the questionaires were so difficult.

" The students didn't want to take the exam because the questions appeared to be so difficult."
_________________
If you need me, I'm here.

[Adonistalavera]

Hi, mr. kitostad,
I really appreciate the correction you made.
thank you.
adonis