Вопрос:

III. Put the verbs in brackets into the correct tense (0, 1 Conditionals): 3) If you ___ (put) a stone in water, it sinks. 4) I ___ (call) you if I finish early today.

Ответ:

  1. If you put a stone in water, it sinks.
  2. I will call you if I finish early today.

The first sentence is a zero conditional; the second is a first conditional.