they've [短縮形]彼らが～です(they have)

1-C. Local band Multiseven will be performing songs they've composed just for Eating Green.Local band Multiseven will be performing songs they've composed just for Eating Green.  

ご当地バンドのマルチセブンが、曲を演奏するでしょう、彼らが作曲したダヨ、イーティング・グリーンのためにダヨ。  

2-C. The exhibits there cover what they've studied about American history this year.The exhibits there cover what they've studied about American history this year.  

展示は、そこのダヨ、カバーしています、彼らが学んだことをダヨ、アメリカの歴史についてダヨ、今年ダヨ。  

3-C. Maybe they've worn them already.Maybe they've worn them already.  

たぶん、彼らはそれらを身に着けてました、既にダヨ。  

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