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Copy and punctuate these sentences adding capital letters, full stops, question marks or exclamation marks.
i love the dodgems, they're brilliant
The correct answer is: I love the dodgems, they're brilliant!
I didn't understand the use of comma and exclamation mark.
My son did get it right but he couldn't explain why.
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Jigneshbharatii love the dodgems, they're brilliant
The correct answer is: I love the dodgems, they're brilliant!

This is not actually the correct answer, and is in fact a comma splice error, albeit a relatively benign one I suppose. Various solutions are possible, including using a dash or semicolon or full stop instead of the comma.

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Thanks. Which uses of dash is used here?
Jigneshbharati Thanks. Which uses of dash is used here?

Sorry, I don't understand the question.

I know we can you semicolon to join related ideas but didn't know about the other two options you suggested. I am sure comma is wrong. My son is Year 2 in the UK.

Is exclamation correctly used? When do we use one?

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JigneshbharatiI know we can you semicolon to join related ideas but didn't know about the other two options you suggested.

Well, you surely know about the full stop option?

I love the dodgems. They're brilliant!

The dash is just another way of joining the statements:

I love the dodgems – they're brilliant!

JigneshbharatiIs exclamation correctly used? When do we use one?

The exclamation mark is correct. The use is, I would say, "obvious". You just have to imagine how someone would typically say the phrase.

They're brilliant!
Fantastic!
Cool!

Do the exclamation show happiness or excitement here or something else?

Thank you so much!

I read in my son's book that they are used for strong emotions.

JigneshbharatiDo the exclamation show happiness or excitement here or something else?

It shows whatever emotion the person feels when they say that the dodgems are brilliant -- probably something like excitement/enthusiasm, but your interpretation of the likely nature of this emotion is as good as mine or anyone's.

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Thanks