I'm learning English as my second language, and what one of my college teacher explained seems not quiet right.
He said that these words, such as 'grab, pull, etc', whenever they are used, it has to be like this:
He grabbed her by the arm, or He took him by the collar.
He grabbed her arm, or He took his collar.
He said the person that comes after the verb always has to be objective, never possessive, and preposition has to follow them.
I've already googled these words and saw many usages like:
'My boyfriend grabbed my arm.Is that abuse?'
I know saying like 'he grab her on the arm' is not wrong, but is it wrong to say or write 'he grab her arm'?