1.整個句子中并不含有什么賓語從句.
它是一個典型的主系表句型.
it是該句的形式主語.
is necessary是系表結(jié)構(gòu),即系動詞is + 表語necessary.
而后面的(for them) to learn the language則是真正的主語.
2.in order to commuincate with these people and to learn from them
= in order to commuincate with these people and (in order) to learn from them
這是倆個用and并列的不定式短語,做句子的目的狀語.
3.翻譯：
為了和這些人們交流/溝通并向其學習,（對）他們（來說,）學習這門語言是有必要的.