Support
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Are you losing the lane?
Leave. The worst thing you can do as a support if you're in an unwinnable lane is stay there and soak up xp while doing nothing. Let him get solo xp so he's at least overleveled and underfarmed instead of underleveled and underfarmed. Oh, I should mention I'm assuming he knows how to play and doesn't over extend and die to get 2 creeps per minute and just sits back and soaks xp to get overleveled, you might have to mention that to him if he's bad.
Now that you've left, what do you do?
1) Protect runes for mid
2) Gank mid with good rune
3) Smoke gank mid
4) Gank opponent safe lane
5) Go to different lane and stay there to push forcing pressure off your safe lane (often called "making space")
6) Hate on mid again
7) Ward aggressively instead of defensively. People often think when they're behind they have to play defensive. However, warding opponent jungle and running at their AM while he's trying to farm can slow him down/get a tp reaction from the axe/wd and they waste time chasing you (again, making space)
8) Smoke gank again
9) You should have a level advantage on your cores from 2 solo lanes and you protecting mid, use it mid game to kill people and turn xp into gold
10) See who's doing well on your team, follow them around (if they need +1 to kill, if they don't let them do what they're doing and just sit far behind them in case of ganks) and help them kill people so you get assist xp/gold and they're safer cause you can sacrifice yourself to make sure the person doing well doesn't die
11) Hope your carry isn't full ****** and can make use of solo xp
12) Farm jungle yourself. It might actually be better your carry gets solo xp and you get jungle farm from pulls, but that's a judgement call.
13) Stack ancients/large camp. Use judgement though, if your mid is getting pushed down at 5 minutes you're probably not going to get to farm those ancients. You can hang out while your carry kills it for some levels.
Basically, there's tons of things to do when you lose laning phase unless you get crushed and die 3 times each. Then the game might just be over.
Fight the urge to TP to a lane when you're in the fountain. Keep the cooldown fresh and save gold for when you're actually needed.
very good tips
Will try most of em when I play next.