보내려고 했는데
This pattern means that someone intended to do something, but an unexpected situation or obstacle came up. You attach it to a verb stem. It is useful whenever you want to say 'I was going to..., but...'. Example: 소포를 보내려고 했는데, 줄이 길어서 조금 기다려야 했다.
소포를 보내려고 했는데, 줄이 길어서 조금 기다려야 했다.
I was going to send a parcel, but the line was long, so I had to wait a little.
