表示同时发生的动作
1. -ing and -ing (e.g. "coming and going")
particle
2. doing such things as...
particle
3. expresses a command
particle
4. to be
auxiliary verb
irregular ru verb, plain form ends with -ri
copula
archaic
5. indicates completion or continuation of an action
irregular ru verb, plain form ends with -ri
auxiliary verb
archaic