After 11 o'clock the guests began to leave by twos and threes.
548
-----------------------------------
を
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action
6. indicates object of d...
1. to start, to begin, to commence, to initiate, to originate
2. to start up (a business, society, etc.), to open (e.g. a store), to establish
3. to start ..., to begin to ...
