1、be worth doing 值得做……
2、be busy doing 忙着做……
2、be busy doing 忙着做……
3、too…to do 太…… 而不能做……
4、so+adj./adv. as to do 如……以致于做
4、so+adj./adv. as to do 如……以致于做
5、It takes sb. some time to do sth. 花某人……时间做某事
6、sb.spends some time doing sth. 某人花……时间做某事
7、It is+adj.+for sb. to do sth. 某人做某事是……
8、It's up to sb. to do sth. 应由某人做某事
6、sb.spends some time doing sth. 某人花……时间做某事
7、It is+adj.+for sb. to do sth. 某人做某事是……
8、It's up to sb. to do sth. 应由某人做某事
9、sb. have some difficulty/ trouble in doing sth. 某人做某事很费劲
