be ongoing
例子:Further meetings are ongoing. 进一步的会议正在进行。
be continuing
例子:He said the meeting was continuing from Monday. 他说,会议从周一开始继续进行。
sth going on
例子:Unfortunately, there was a meeting going on and I was told to come back in an hour. 不幸的是,当时正在开会,我被告知一小时后再来。