Find the mistake in three of these sentences.Then correct the mistakes. 1.He told them invest in a good training course 2 She said that gaining the staff trust is important 3 They asked him how he deal with those proplem in his...

Find the mistake in three of these sentences.Then correct the mistakes. 1.He told them invest in a good training course 2 She said that gaining the staff trust is important 3 They asked him how he deal with those proplem in his previous job