Question

 Marque X apenas nas frases em que apresentam a correta forma contracta do verbo TO BE: *

I am a engineer. / I'm a engineer.
We are young. / We're young.
He is happy. / He's happy.
They are tired. / They's tired. ​

Answer 1

Explicação:

A forma contracta é sempre identificada por um apostrofo(`) que eliminou  uma letra, então as frases que apresentam a forma contract correta ai são a 1, 2 e 3

I`m a engineer.

We`re young.

He`s happy.

They`s tired.( está incorreta, pois teria que ser they`re)

Answer 2

Olá, tudo bem? :)

I am a engineer. / I'm a engineer. X

We are young. / We're young. X

He is happy. / He's happy. X

They are tired. / They's tired. ​

Espero ter ajudado! :)