回答如下:
若主语是抽象名词、不可数名词、
动名词、不定式、
主语从句,谓语动词通常用单数形式。例如:
His absence from classes makes me very angry.
The money on the desk is mine.
His being late yesterday is true.
To live here is very pleasant.
For her to live here is my idea.
What to do next is not clear.
That he is in hospital is true.
What you said is not right.
但若上述主语是并列主语,谓语动词应该用复数形式。例如:
Water and fire are not incompatible.
To find problems and to settle problems are what we must do at present.
Listening, speaking, reading and writing are of great importance.
That he is out of work and that his wife is ill in bed are just what we leaders should be concerned about.
What you say and what you don't match up.