whether

used for introducing a choice between two or more possibilities

si, si... o no

• whether A or B

Collocations whether to do sth · whether sb will come

• I don't know whether I should go.

  No sé si debería ir.

used for introducing a question or statement about something that is not certain

si, si... o no

• whether A or B

Collocations ask whether sb will come · wonder whether sth is true

• She asked me whether I was free.

  Ella me preguntó si estaba libre.

used for introducing a condition or possibility in an if-clause

si, en caso de que

• whether A or B

Collocations in case whether sth happens · if it is the case whether sth is true

• We'll go in case whether it rains.

  Vamos a ir por si llueve.

used for introducing the reason why someone makes a decision or takes an action

porque, ya que

• whether A or B

Collocations decide whether to do sth · choose whether sb will come

• He decided whether he should go.

  Él decidió si debería ir.

used for introducing a statement about something that is not certain or known

si, en caso de que

• whether A or B

Collocations say whether sth is true · state whether sb will come

• She said whether she was coming.

  Ella dijo si iba a venir.

used for introducing a question about something that is not certain or known

si, en caso de que

• whether A or B

Collocations ask whether sb will come · wonder whether sth is true

• He asked me whether I was coming.

  Él me preguntó si iba a venir.

used for introducing the reason why someone makes a decision or takes an action based on uncertainty

porque, ya que

• whether A or B

Collocations decide whether to do sth · choose whether sb will come

• She decided whether she should go.

  Ella decidió si debería ir.

used for introducing a statement about something that is not certain or known, often in formal contexts

si, en caso de que

• whether A or B

Collocations say whether sth is true · state whether sb will come

• The committee stated whether the proposal was feasible.

  El comité declaró si la propuesta era viable.