Are the following sentences grammatically correct?

1/ This software will at least buy us some time to look for a better solution.
2/ He was falling behind with his masters, so he tried to buy time by saying he was unwell.
3/ This job takes longer than I thought. Can you talk to the boss so that he buy us some time till the end of the week?

Thanks in advance!

Question

Are the following sentences grammatically correct?

1/ This software will at least buy us some time to look for a better solution.
2/ He was falling behind with his masters, so he tried to buy  time by saying he was unwell.
3/ This job takes longer than I thought. Can you talk to the boss so that he buy us some time till the end of the week?

Thanks in advance!

Answer

Well done. 1 and 2 are good. With 3 you just need to change buy to buys as boss is singular