Here is a nice little exercise for you. You should fill in the connectors “and,” “but,” and the relative pronouns “who,” “which” or “that.”
Sounds easier than it is, but hopefully you’ll manage with this explanation:
And – add new information to your sentence.
But – add a contrast to your sentence. A contrast is something that is different or the opposite from what was said before.
Who – to introduce a new part of a sentence about a person that was mentioned before.
Which – to introduce a new part of a sentence about a thing that was mentioned before.
That – to introduce a new part of a sentence about a person or thing that was mentioned before. If it connects to a thing, “that” must always introduce necessary information to a sentence. If you can leave out the extra information, use “which.”
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