• I (to lend) you my laptop if you (to promise) to be careful with it. • If you (to add) some tomatoes, the sauce (to taste) much better. • If Tom (to pull) this string, he (to open) the box. • If I (to find) Simon's mobile, I (to take) it to the office. • We (to get lost) if we (to forget) the town map.

Ответ:

• I will lend you my laptop if you promise to be careful with it.
• If you add some tomatoes, the sauce will taste much better.
• If Tom pulls this string, he will open the box.
• If I find Simon's mobile, I will take it to the office.
• We will get lost if we forget the town map.

Проверка за 10 секунд: Обратите внимание на правила согласования времен в условных предложениях первого типа.

Лайфхак: В условных предложениях первого типа в главной части часто используется "will", чтобы говорить о будущем.