Question 1

Hundai is only having trouble with one of their new models.

My answer

Hyundai is having trouble with one of its new models.

Question 2 He claimed he knows a star athelete who will sign with the company.

My answer

He said he knew a star athlete who would sign with the company.

Question 3 Travelling across India, it's vastness effected him.

My answer

Travelling across India, he was affected by its vastness.

Question 4

Like I said, he should be like I and do like I do.

My answer

As I said, he should be like me and do as I do.