crack。cracking。cracks。cracked 区别

The glass is going to crack. 那玻璃将会爆裂。(未来式)

The glass is cracking. 那玻璃正在爆裂。(进行式)

The glass cracks when being hit too hard. 若打得太大力，玻璃会破裂(现在式)

There are cracks on the glass. 玻璃有裂痕。(这里是用作名词"裂痕")

The glass has cracked. 玻璃破裂了。(过去式)

很希望会对你有帮助。