问sing三单形式和ing形式

三单形式和ing形式是：sings，singingI can'tsingif you go playing the fool .如果你拿我打趣，我就不唱了！They all joined insingingthe christmas carols .他们一起唱圣诞颂歌。

"why in hell don't yousingout"“你见鬼了吗，为什么不叫喊？”Theysangsongs to keep their morale up .他们唱歌以保持士气高昂。Now everybodysing! i 'll take the lead .现在大家唱歌，我起头。She cleared her throat , and startedsinging.她清了清嗓子，唱了起来。Youth would never comesinging.欢乐的青春岁月，再也不会回来了。The birds weresingingand the bees buzzing .鸟儿在歌唱，蜜蜂在嗡嗡叫。Thesingingis getting more and more spirited .歌声越来越高昂。It takes a lot of good breath tosing.唱歌是要费掉很多气力的。