Hi Jordana, I'm a PhD student who has been to many conferences, so I feel like I can answer this question. Generally, a keynote speaker is just someone who has been invited to speak on a topic within a specific field. So one conference could have multiple keynote speakers. However, a plenary lecture is usually given by a senior scholar who is saying something of interest to everyone, rather than something more specialized. It's more about the "state of the field." It is called plenary because the "plenum" is invited. Plenum meaning the entire conference. There are no other events scheduled for this time so that everyone can come. But for a keynote speaker at a larger conference or event, there may be another speaker at that same time or another kind of conference event. I work in literature, so this may be different for other fields or smaller conferences (where there might be only one keynote speaker, so it's more like a default plenary lecture). 2. a. read. b. sing c. lie All sound better to me with the finite verb. But I'm not a grammar expert, so someone who is might be able to tell you why it sounds better that way! I'd also recommend using https://ell.stackexchange.com. English Stack Exchange for ELL (english language learners). They have a lot of grammatical information and might be able to give you a better answer. Ciao! Caro