Could I use ?
a. I knew him for inventing the telephone.
b. I knew him for Invented the telephone.
c. I knew him can/could do it.
e. I knew him having a problem.
f. I knew him have a problem.
are they correct ? Please correct my sentence and feel free to fix and give a detail explanation of this topic.
They are all incorrect. a. I knew he invented the telephone.
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They are all incorrect.
a. I knew he invented the telephone.
b. I knew he invented the telephone.
c. I know he can do it. / I knew he could do it.
d.
e. I knew he had a problem.
f. I knew he had a problem.
CB
a. I knew him for inventing the telephone. OK
b. I knew him for Invented the telephone. Wrong. You cannot use a past tense form after a preposition. You can only use the present participle (called a gerund.)
c. I knew him