Question

1. (Efomm 2018) Mark the correct alternative.

a) We had better not to call him today.

b) ought to read this book, oughtn't 1?

c) John is eighteen, so his sister must to be twenty.

d) suggested she added this book to the list, and she finally would.

e) Last year I lived with my boyfriend but I knew I can live with my parents again at any time.​

Answer 1

a) True.

b) False. Falta sujeito

c) False. "must be" e não "must to be"

d) False. Falta sujeito

e) False. "could" e não "can"

Answer 2

Alternativa correta é B (I ought to read this book, oughtn't I?), mas você copiou errado para cá.

Corrigindo as demais:

a) We had better not to call him today.

We had better not call him today. Não se usa verbos com "to" depois de modais.

c) John is eighteen, so his sister must to be twenty.

John is eighteen, so his sister must be twenty. Não se usa verbos com "to" depois de modais.  

d) I suggested she added this book to the list, and she finally would.

I suggested she added this book to the list, and she finally did. É preciso usar "did" pois ele faz referência ao "added this book to the list".

e) Last year I lived with my boyfriend but I knew I can live with my parents again at any time.​

Last year I lived with my boyfriend but I knew I could live with my parents again at any time.​ Usa-se "could" porque a oração está no pretérito.