It is only recently that crude oil has come to be used to make chemical products.

The future progressive tense is used when expressing events and action in progress at some future point, however the example sentence cannot be understood in that way.

Language has, at the same time as being method of expressing one's thoughts, the side of being something used to think with.

When the antecedent is this, that, these or those it is usual to use 'which'.

"Past tense" is used in connection with actions in the past.

The speaker illustrated the theory with examples.

For example, vervet monkeys learn to use a certain call in the presence of circling eagles, who prey on the monkeys.

The trial lawyers couldn't get past the Mafia leader's stonewalling tactics.

A capital letter is used at the beginning of a sentence.

He used water colors in short vertical brush-strokes.

He employed dishonest means in his business.

He had some money in an account that he'd set aside for his kids.

He substituted a light for the bell.

The methodology used in his study is also helpful to us in conducting our research.

We used the transcripts of the recordings of telephone conversations.

Instead of giving the money, that is the normal coin of the realm, which is the phrase that everyone used then, they would give them a token, and this token might be metal, might be wood, might be cardboard.

It is one thing to acquire knowledge; it is quite another to apply it.

The teacher illustrated his theory with pictures.

A red light is often used as a danger signal.

People have eaten with their fingers from the beginning of history.