N3 Grammar Mondai

The first grammar is てからでないと
例文　実物を見てからでないと買うかどうかは決められない。
The second is きる
例文　全員力を出し切って戦ったが、試合には負けてしまった。
If you can explain these grammar points or post some useful examples i would appreciate it.

てからでないと : '' It is after doing something that I can do something else.''  In other words, ''I need to do something first, then I can do something else.'' or '' I need to do something first, otherwise I can't do anything else.''

実物を見てからでないと買うかどうかは決められない。 '' It is after taking a look at the real thing that I can decide whether I am going to buy it or not.''

ex. It is only after you've compelety done your own duties that all of your men will follow your instructions.'' 「自分の職務を完全におこなってからでないと、部下は君の指示には従わないよ。」                                                                                                 [My impression is that we tend to use double-negative forms in Japanese more often than you do in English in order to show a positive meaning in sentences.]

ex.''We need to get a permission to use the room first, otherwise we can't use it.''(or ''then we can use it.'') 「初めに部屋を使う許可を得てからでないと、部屋は使えない。」

きる : In one word, ''completely'' or ''throughly'' ,or ''up'' or ''out'' together with some particular verbs, like ''use up'', ''be tired out''.

全員力を出し切って戦ったが、試合には負けてしまった。All the members fought with their might, but they lost the game.

ex.'' I used up gas, and so the car didn't run at all.'' 「ガソリンを使いきったので車は全然動かなかった。」

    ''I was completely tired (or tired out.). So I couldn't walk farther.''「私は疲れきっていたので一歩も歩けなかった。」

I hope my explanation makes sense to you.　　Good luck.