keep an eye on

意味

to watch or look after someone or something

人や物を見張る、見守る.

例文

1. 1My sister keeps an eye on her son's homework but never does it for him.
2. 2A security guard kept an eye on the crowd as the doors opened.
3. 3Can you keep an eye on the baby while I nip to the shop?
4. 4Our neighbour kept an eye on the house while we were away and even watered the plants.
5. 5The bank keeps an eye on unusual payments, so it froze my card after a strange purchase.

文法

変化するのは keep だけ：kept、keeping。見守る人や物は on の直後に置く。