When to use gerund or infinitive - answers

We got a new card holder in order not to lose our credit cards.
I talked to the students about working harder but I couldn't get them to study.
I asked him not to go there but he went anyway.
I bought this new software to learn Chinese.
She's going to stop to eat dinner so she may be late.
I don't think Tom enjoyed helping me study for the test.
I resented his saying that. He could have been more polite.
Are you ready? It's time to go.
My mother makes me do my homework before I go out.
My mobile phone is in my bag but I don't remember putting it there.
We're eighteen so we're old enough to vote.
He's not used to waking up so early.
It isn't difficult to understand this textbook.
Living in a foreign country is sometimes difficult.