第三人称单数 现在分词 过去式 过去分词
照看孩子)babysit -s babysiting -ed -ed
visit -s -ing -ed -ed
take -s taking took taken
rent -s -ing -ed -ed
see -s -ing saw seem
watch -es -ing -ed -ed
have has having had had
fold folds folding -ed -ed