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Adding to other great answers (I upvoted both of them), I would suggest several sentences for your thought. As you know, I am not a native English speaker, but the following sentences helped me a great deal understanding so called "double negative sentences".

  1. I ain't (don't) got (have) no money.

The double negative (DN) is used for emphasis. It means I don't have money. I really mean it.

  1. It won't do you no good.

The DN is also used for emphasis. It means It won't do you any good or There is no good doing this.

  1. I can't not think about you.

The DN is used to make a positive sentence (We can also say it is used for emphasis). It means I always think about you or I can't stop thinking about you.

When there is a boyfriend visiting ahis girlfriend after six months of not seeing each other and he says, "I can't not think about you," what would you think he means?

It all depends on situation and the following link has more examples for your further reading and understanding. One thing to remember is the DN doesn't always make a positive sentence.

Adding to other great answers (I upvoted both of them), I would suggest several sentences for your thought. As you know, I am not a native English speaker, but the following sentences helped me a great deal understanding so called "double negative sentences".

  1. I ain't (don't) got (have) no money.

The double negative (DN) is used for emphasis. It means I don't have money. I really mean it.

  1. It won't do you no good.

The DN is also used for emphasis. It means It won't do you any good or There is no good doing this.

  1. I can't not think about you.

The DN is used to make a positive sentence (We can also say it is used for emphasis). It means I always think about you or I can't stop thinking about you.

When there is a boyfriend visiting a girlfriend after six months of not seeing each other and he says, "I can't not think about you," what would you think he means?

It all depends on situation and the following link has more examples for your further reading and understanding. One thing to remember is the DN doesn't always make a positive sentence.

Adding to other great answers (I upvoted both of them), I would suggest several sentences for your thought. As you know, I am not a native English speaker, but the following sentences helped me a great deal understanding so called "double negative sentences".

  1. I ain't (don't) got (have) no money.

The double negative (DN) is used for emphasis. It means I don't have money. I really mean it.

  1. It won't do you no good.

The DN is also used for emphasis. It means It won't do you any good or There is no good doing this.

  1. I can't not think about you.

The DN is used to make a positive sentence (We can also say it is used for emphasis). It means I always think about you or I can't stop thinking about you.

When there is a boyfriend visiting his girlfriend after six months of not seeing each other and he says, "I can't not think about you," what would you think he means?

It all depends on situation and the following link has more examples for your further reading and understanding. One thing to remember is the DN doesn't always make a positive sentence.

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source | link

Adding to other great answers (I upvoted both of them), I would suggest several sentences for your thought. As you know, I am not a native English speaker, but the following sentences helped me a great deal understanding so called "double negative sentences".

  1. I ain't (don't) got (have) no money.

The double negative (DN) is used for emphasis. It means I don't have money. I really mean it.

  1. It won't do you no good.

The DN is also used for emphasis. It means It won't do you any good or There is no good doing this.

  1. I can't not think about you.

The DN is used to make a positive sentence (We can also say it is used for emphasis). It means I always think about you or I can't stop thinking about you.

When there is a boyfriend visiting a girlfriend after six months of not seeing each other and he says, "I can't not think about you," what would you think he means?

It all depends on situation and the following link has more examples for your further reading and understanding. One thing to remember is the DN doesn't always make a positive sentence.