To put the verbs in the brackets into the second conditional tense, you need to use the structure: "If + past simple, would + base verb." The second conditional is used to talk about unreal or hypothetical situations in the present or future. Here are the sentences with the verbs correctly placed in the second conditional:
If I saw John, I would tell him your news next week.
You would meet my brother if you went to town on Monday.
Meg sleeps only 5 hours a day. If she slept longer, her health would improve fast.
If she wanted to talk to me, she would ring me up tomorrow. I guess she doesn’t.
If you needed help, my father would help you.
We would have a picnic if the day were nice.
I would understand Mr. Brown if he spoke slowly.
If you saw a policeman, he would show you the way.
Each sentence reflects a hypothetical situation and the potential result if that situation were true. Remember that in the second conditional, "were" is often used for all subjects when forming the verb "to be," although "was" is sometimes informally used for the first and third person singular.
