My son wrote the following sentences about shopping.
We do our shopping at Morrisons. I help my mum pulling trolley.
We buy food, fruit, milk and vegetables.
Should he have used "foods and fruits" instead singular in this context?
Jigneshbharati We do our shopping at Morrisons. I help my mum to push the trolley / by pushing the trolley . Normally we push, not pull, a trolley.
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JigneshbharatiWe do our shopping at Morrisons. I help my mum to push the trolley / by pushing the trolley.
Normally we push, not pull, a trolley. "help ... to push" means that he and his mum push together. "help ... by pushing" probably is understood to mean that he does it alone.
JigneshbharatiWe buy food, fruit, milk and vegetables.
You could write that you buy fruit, milk and vegetables. Another possibility is to add the word including before fruit.