effective的各種形式

動詞形式是affect，名詞形式是effectiveness，副詞形式是effectively，例如：

1、Television is an effective means of communication.電視是一種有效的通信手段。

2、It has been demonstrated that this drug is effective.這藥已證實是有效的。

3、Cooperative activity is essential to effective community work.要把社區工作做好，協作活動是必不可少的。