1. if they_ him he will help ( tell,told,tells)
2. if he_ it, i will call the police ( steals,stole,steal)
3. if i_ last in the exams everyone would laugh at me ( come,came,comes)
4. if you disturbed,i_ report you to my teacher.
5. i can ring him up,if i_ his number.
6. i would lend it to you,if i_ a pen.

please help me please!
and show me the correct answers
thanks​