I don't know which page in the book "Practical English Usage" I can learn about the usage of "have problems V-ing".
I try to look this usage up in "Practical English Usage" (Michael Swan).
Because I do not understand a sentence like the following one.
"Students find it so easy to blame others or complain about their difficult situation when they have problems preparing for the IELTS test."
The structure of the form "have problems V-ing" is not clear to me.
I hope somebody bring answers to these questions.
Is it correct to say
"...have problems of preparing for the IELTS test."
or
"...have problems to prepare for the IELTS test."?
or
"...have problems to preparing for the IELTS test."?
What is the difference between those three sentences in meaning?
How do I look this usage up in "Practical English Usage" (Michael Swan)?