By Modal auxiliaries, Present continuous

Cool Breeze wrote:1) Leaving taps on and using too much water is very bad for the environment. (Easy, 2 gerunds right?) Right.2) Everyone should be recycling rubbish. Should is a modal auxiliary or a defective auxiliary as these verbs are also called. It is always followed by an infinitive. Be...

1) Leaving taps on and using too much water is very bad for the environment. (Easy, 2 gerunds right?) Right.2) Everyone should be recycling rubbish. Should is a modal auxiliary or a defective auxiliary as these verbs are also called. It is always followed by an infinitive. Be recycling is a...