problem ingとonceについて

Point once / have no problem ing

A: I met him once.
B: Really?
A: So I have no problem talking with him.

I have met him
I talk with him.

1. I have changed my job.
I change my job again.

2. I have been transferred.
I live in a place that I don’t know.

3. I have stayed at the hotel.
I use a different hotel.

4. I have been there.
I guide you.

5. I have joined the festival.
I change our destination next time.

once(経験)    「(かつて)~したことがある」 I have met him. = I met him once. * 現在完了の経験と同じ意味をonceを使った過去形で表せます。

have no problem ing    「~するのは問題ない」 I have no problem of staying up late. 夜更かししても問題ない *後ろは必ずingです。

1. I changed my job once. I have no problem changing my job again.
2. I was transferred once. I have no problem living in a place that I don’t know.
3. I stayed at the hotel once. I have no problem using a different hotel.
4. I went there once. I have no problem guiding you.
5. I joined the festival once. I c have no problem changing our destination next time.

問題
1. その地区に住んだことがある
2. 便を変えても問題ない
3. 海外でえらい目に合ったことがある
4. 日程を変えても問題ありません