Could you check whether the following sentence is right and natural? Thank you in advance.
After a couple of trials, I had a sense of how to make it faster.
* ( ) means the preposition 'of' in the brackets can be dropped.
lucas21c After a couple of trials, I had a sense of how to make it faster. OK. lucas21c * ( ) means the preposition 'of' in the brackets can be dropped.
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lucas21cAfter a couple of trials, I had a sense of how to make it faster.
OK.
lucas21c* ( ) means the preposition 'of' in the brackets can be dropped.
I see none, but 'of' must be kept.