4. Выбери способ образования сравнительной степени: adjective + -er или more + adjective. My backpack is heavier than yours. The second part of the film is more exciting. This explanation is more useful for beginners. The river is narrower here than near the bridge. This route is safer at night.

Adjective + -er:

• heavier — от heavy;
• narrower — от narrow;
• safer — от safe.

More + adjective:

• more exciting — от exciting;
• more useful — от useful.

Короткие прилагательные обычно получают окончание -er, а более длинные — конструкцию more + adjective.