Look at the list of expressions below!
(i) Why don't we work on the project together?
(ii) Let's go to the park today. It looks really nice outside.
(iii) Your bag looks very heavy. Shall I carry it for you?
(iv) What about buying a Redmi instead of an iPhone? It's cheaper.
(v) It’s dark in here. Would you like me to turn on the light?
From the list, the expressions for making suggestions include …