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Okay, sallow here are three times that you can leave out that the first is with reporting verbs, the simplest of which is probably, say and tell.

So you can say she said that she didn't want to go or she said she didn't want to go.

This also works for other reporting verbs such as learned, discover, thought felt, et cetera.

For example, I discovered he'd borrowed my car without asking, but it doesn't work for all of them.

So check the verb pattern carefully, for example, with inform.

He informed me that he had asked permission and that I'd forgot secondly, with two word conjunctions conjunctions, such as so that now that provided that and providing that often talk about purpose, result and conditions in a formal style, often in writing.

We will keep the that, but in an informal style, we can also drop it.

So, for example, my niece will attend your school this summer so that she can improve her English.

Or I went to Switzerland for three weeks so I could learn to ski.

Thirdly, in defining relative clauses in defining relative clauses, we often use the relative pronoun that as a replacement for who or which to represent a person or a thing.

For example, the work that she does for this company is excellent.

When the relative pronoun that represents the object of the relative clause, we can leave it out.

So, same example.

The work she does for this company is excellent.

This is a very complicated area of grammar, so firm or and full information, go to our website BBC learning english dot com.

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I hope I've given you a few ideas.

If you have a question for learners, questions you can e mail is on learning dot English at BBC dot co dot UK.

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