We use a singular verb after an indefinite pronoun.

When we refer back to an indefinite pronoun, we normally use a singular pronoun.

We use some... in negative sentence.

We use "Every..." to mean "All..."

I am sure I put down my keys ________.

Calm down. There is ____ to worry about.

I heard a knock at the door but there was ________ there.

We didn't see ________.

Be quite ! ________ is coming.

I don't think ________ knows the answer to that question.

I've got _______ to tell you.

There was water all over the floor. It was ________.

I can't make my point clear.

______ understands me!

I was really bored during the holiday.

I did _______ and went _________.

Everybody ______ talking about the new soap opera now.

Everybody enjoyed the concert, so _____ stood up and clapped.

We can go _______ we want!

We usually use "Any..." with ______ sentence.

We usually use "Some..." with ______ sentence.