Question

1. Fill in the blanks with if /whether
a) Do you know if the class has started?
I don't know if (whether) the class has started (or not).
b) Was the exam difficult?
I don't remember if (whether) the exam was difficult or not.
c) Do you know what the date is?
I don't know if it's Friday or Saturday.
d) Do you know if they are arriving at six o'clock?
I don't know (if) whether they will arrive at six or at seven.
e) Do you know if they are coming?
I don't know if (whether) they are coming or not.
f) Are you going to the movies tonight?
I don't know if (whether) I am going to the movies or not.
g) Was she late getting home last night?
I don't know if (whether) she was late getting home last night or not.
h) Do you remember how to get to the party?
I don't remember how to get to the party.

Answer 1

Resposta:

⇒⇒ Differences between ''if'' and ''whether''

a) Do you know if the class has started?

I don't know whether the class has started or not.

b) Was the exam difficult?

I don't remember whether the exam was difficult or not.

c) Do you know what the date is?

I don't know if it's Friday or Saturday.

d) Do you know if they are arriving at six o'clock?

I don't know  if they will arrive at six or at seven.

e) Do you know if they are coming?

I don't know whether they are coming or not.

f) Are you going to the movies tonight?

I don't know whether I am going to the movies or not.

g) Was she late getting home last night?

I don't know whether she was late getting home last night or not.

h) Do you remember how to get to the party?

I don't remember how to get to the party.

Explicação:

⇒⇒ If - whether >>> expressam possibilidades de maneiras diferentes.

• if >> há condição ou suposição - uso mais comum em ''conditional sentences''

• whether >> as opções são delimitadas - contexto mais formal

→→→ Exemplos com uso de ''if''

If you study, you will get good grades.

Se você estudar, você vai tirar boas notas.

They would spend some days in Greece if they had money.

Eles passariam alguns dias na Grécia se eles tivessem dinheiro.

→→→ Exemplos com uso de ''whether'' - sempre após verbos como ''know'', ''discuss'', ''ask'', ''wonder'' entre outros.

I’m not sure whether John will come to the party.

Não tenho certeza se John virá para a festa.

My little sister didn't know whether to go cry or laugh.

Minha irmãzinha não sabia se chorava ou ria.

It doesn't matter whether you win or not.

Não importa se você ganhar ou não.

→→→ Exemplos com uso de ''whether'' -  após preposições

Diane worries about whether she'll be a good mother.

Diane se preocupa se será uma boa mãe.

→→→ Exemplos com uso de ''whether'' -  antes de infinitivos com ''to''

We are not sure whether to stay home or go out for dinner.

Nós não temos certeza se ficamos em casa ou saímos para jantar.

They don't know whether to go to the party or not.

Eles não sabem se vão para a festa ou não.