Listen to a lecture about the helix shape to practise and improve your listening skills.

Do the preparation task first. Then listen to the audio and do the exercises.

Discussion

Language level

Advanced: C1

Comments

Dear Team,
I think,in Task 2/quest.5, we can write either ''alternating'' and ''alternate'',using it as an adjective.Could you check it , please, if I'm right?

Hello nikoslado

Yes, it appears that you are right, i.e. that 'alternate' is also possible in that sentence. In my experience, 'alternating' is much more commonly used, but I will change the exercise so that 'alternate' is also correct.

Thanks for pointing this out to us.

All the best

Kirk

The LearnEnglish Team