谁能帮我看看这些单词的复数

问题描述:

谁能帮我看看这些单词的复数
1pen 2that 3brother 4his 5ruler 6this 7stster 8my 9box 10he 11parent 12tonato 13famihy 14it 15l 16hero 17cousin 18friend 19book 20photo

pens those brothers their rulers these sisters our boxes they parents tomatoes families they heroes cousins friends books photos