Assertive Indefinite Pronouns and Determiners

大约, 差不多

There were some 50 people at the event.

活动上有大约50人。

某人, 有人

Someone left their umbrella in the hallway.

有人把他们的伞忘在走廊里了。

某人, 有人

Somebody left their keys on the table.

有人把钥匙忘在桌子上了。

某物, 某事

I need to buy something for dinner tonight.

今晚我需要买一些东西做晚餐。

确定, 确信

Being certain of her feelings, she decided to confess her love.

对自己的感觉确定后，她决定表白她的爱。