1. When he was ill, he didn't play football.

2. Being ill, he didn't play football.
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3. If he is ill, he will not play football.

4. Being ill, he will not play football.
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5. Although he was ill, he played football.

6. Although being ill. he played football.

7. Being ill, he played football.
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Would you check the sentences, pelase?
Which ones are ungrammatical?

1 and 2, 3 and 4, and 5 are all fine.

6 is strange; 7 is incorrect.

Sure! I'd be happy to check the sentences for you.

Grammatically correct sentences:
1. When he was ill, he didn't play football.
2. Being ill, he didn't play football.
3. If he is ill, he will not play football.
4. Being ill, he will not play football.
7. Being ill, he played football.

Ungrammatical sentences:
5. Although he was ill, he played football. (The correct sentence would be: "Although he was ill, he didn't play football.")
6. Although being ill, he played football. (The correct sentence would be: "Although he was ill, he played football.")

So, sentences 5 and 6 are ungrammatical.