Is4
1.It is necessary.
虛主詞It,
動詞is,
主詞補語necessary
2.It is necessary
to obtain the advice.
真主詞 to obtain the advice
3.It is necessary to obtain the advice
of nutritionists.
介係詞片語of nutritionists當
adj. 修飾
advice
4.It is necessary to obtain the advice of nutritionists
before deciding what to eat.
時間副詞before deciding what to eat
之中(what to eat)
為名詞片語做deciding的受詞 說明時間性
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