Complete the sentences with the correct forms of the verbs. 1. if i clean (clean) the house, my parents will give (give) me some extra money . 2. i (phone) mike if he (not arrive) before 10 o'clock. 3. if you (speak) very fast, they (not understand) you. 4. if marco (phone) tonight, you (tell) him i'm at sabina's house? . 5. your parents (not know) if you (not tell) them.