This happens. Someone sends you a giant email full of personal detail, personal conversation between the pair of you, and oh, in the middle, there’s a job they need doing. Actually, it’s a job where you need to ask someone something for them.
Highlight that bit. Just that bit. Only that sentence. Now hit Forward.
Practically whatever email system you use, you will now have in front of you a brand new email message with that highlighted text and nothing else.
You didn’t have to copy and paste, your email just did it for you. Address the email, send it off, done.
If that one email has several tasks for many people, do this to each one. Highlight, forward, send. Highlight, forward, send.
If it’s a task for you and your To Do app can handle this, you could do exactly the same thing but email the task into your app. OmniFocus users get a secret email address for precisely this job. And I use the bejaysis out of it. Highlight, forward a task to OmniFocus, done.