给出下列各词的适当形式(英语)
1.favorite______(同义词)2.holiday______(复数)3.ski____(现在分词)4.play_____(名词)5.join_____(同义词)6.he____(宾格)7.go______(单三人称)8.prefer______(同义词)9.much_____(最高级)10.swim______(现在分词)