PASO 1Elige la opción correcta
PASO 2Agrega los ejercicios que te gustan a Favoritas
Others isn't an adjective but a pronoun. The adjective is other (without the s) We can say: The others aren't here, omitting the noun boys.
Use the demonstrative pronoun one (plural ones) in place of a noun mentioned before.
Coward (= one without courage) is the noun. The adjective is cowardly.
Where or not is implied, use whether, not if. Unlike whether, if does not expect a Yes or No reply: I shall speak to him if he comes.