'Chasing Cars' by Snow Patrol is a lovely song, ruined by the ungrammatical chorus. Surely it should be 'If I just lie here'? To lie is a continuous action. I'm no grammatical whiz, but I rule in pedantry, so I am beatific having just found this little corner of MN. Apologies if this has already been picked over.
This takes me back to foreign language learning - we're talking about transitive and intransitive verbs here. It's either "to lie (down)" or "to lay something (down)" - to lie (down) is intransitive because it has no object (i.e. you can just say "I'm lying down" on its own), and to lay (something) down is transitive because it has an object, i.e. the "something" part (you can't just say "I'm laying" - you have to say what you are laying). You can't "lie" something down in the same way that you can't "lay" yourself down. They often get confused because the past participles (lain and laid respectively - "I had lain down for a moment" and "I had laid the table") sound similar.
Sorry Horry is right, having seen the rest of the lyrics above , however the whole lie/lay issue is something that often gets mixed up for the reasons I mentioned too, when not used in the conditional sense.