4. Choose the correct form of the verb. 1. If the weather (is / will be) nice tomorrow, we can go to the beach. 2. It will be difficult to find a hotel if (we arrive/we'll arrive) late. 3. The alarm will ring if there (is/will be) a fire. 4. (I, m / I, ll be) surprised if (the get / they, ll get) married

1. If the weather is nice tomorrow, we can go to the beach. 2. It will be difficult to find a hotel if we arrive late. 3. The alarm will ring if there is a fire. 4. I'll be surprised if they get married.

Таким образом, в условных предложениях I-го типа в главной, основной части используется Future Simple, а в придаточной, после слов if / when глагол ставится во времени Present Simple.