I left out these last sentences on grammar.Thank you, Writeacher.

Question

1) If the machine stops, you press this button.
Incorrect: if the machine stops, you will press this button.
2) Complete the following sentences with who, which, whose. Write the relative pronoun in brackets when it can be omitted.
3) The girl (who) I met at the seaside last month is Peter's girlfriend.

Answer 1

1) If the machine stops, you press this button.
Incorrect: if the machine stops, you will press this button. <~~Yes, that's incorrect choice of tense.

2) Complete the following sentences with who, whom, which, or whose. Write the relative pronoun in brackets when it can be omitted.

3) The girl (who) I met at the seaside last month is Peter's girlfriend.
Answer is "whom."