Modal verbs

It's possible she didn't pass her exam.

She............

Answer explanation

Puedes usar "may" or "might", porque significa que hay poca posibilidad, pero fíjate que la frase original está en "pasado", y es por ello, que debes usar un modal perfecto.

Don't tell Susan what happened.

You.........

It's impossible you're hungry again.

You...............

I'm sure he has a big garden in his house.

He............

When David was three years old he __________ write his own name.

• must

• could

• is able to

Answer explanation

No se puede elegir "is able to" porque está en presente y la frase indica que estamos hablando de pasado. Sin embargo, sí se puede usar "was able to", pero no estaba en la opción.

In my opinion, Sheila ___________ apologise for her rude behaviour.

• should

• have to

• can

Answer explanation

Podría ser también "have to" en lugar de "must", pero no en esta frase porque ese "ella", por lo que "have to", en presente debe ser "has to"

Pupils ____________ smoke in the school grounds. It is forbidden.

• couldn't

• mustn't

• needn't

The bus _________ be late because of the heavy rain.

• might

• should

• can

I´m sorry, I ____________ help you. I don´t know anything about cars

• shouldn't

• can't

• needn't

Look at these clouds. I think it (a)   rain soon

• might
• must