Singular and plural noun

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• These photos are not good.
• The potatoes are under the sink.
• Tomatoes are cheaper this week.
• We took a lot of photos there.
• How many kilos does it weigh?
• Give me one more tomato, please.
• There is only one potato left in the bag.
• Do you like tomatoes?
• I'd like three kilos of apples, please.
• There are two pianos in our school.
• We may call these boys real heroes.
• Half a kilo of sugar will do.
• Don't play a hero, will you?
• There are in fact two heroes in this novel.
• I do not want so many potatoes.
• I'd like to take a photo.
• Do you play the piano?