3

I have this sentence :

Today's lecture will spark a lot of discussion, and I just want to let you know that I welcome it, so please feel free to jump in.

I have three questions:

  1. Where is the subject of the verb "feel"?
  2. If there is no subject, then it must be "felt", right?
  3. What does "jump in" mean?
5

The implied subject is you (whoever is being addressed), as is commonly the case in commands, requests, invitations, etc.

[You] feel free to jump in.
[You] step this way, sir.
[You] go away!


Jump in (or common alternatives such as pitch in, dive in, leap in, etc.) simply means become completely [metaphorically] immersed in the discussion, and participate, actively contribute, say something.

3

The phrase is using the imperative mood, which is the mood used for requests or commands (among other cases).
The imperative mood is a particular mood, since it is used only for you; that is the reason why the subject is not explicit: It is always you.

To form the imperative mood, take the sentence in the indicative mood (simple present), and remove the subject; from "You eat onions on Saturdays." you get "Eat onions on Saturdays."
"Felt free to jump in" is wrong; the correct one is "feel free to jump in."

"Jump in" has two meanings:

  • To interrupt a conversation
  • To start to do something very quickly without spending a long time thinking first

In your case, the meaning is the second one.

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