Я мою волосы каждый день, мне нужен хороший шампунь.

Questions & Answers about Я мою волосы каждый день, мне нужен хороший шампунь.

Why is there no preposition before каждый день?
To say you do something "every [time period]", Russian simply uses the word каждый and the time word in the bare Accusative case, with no preposition. Since день (day) is a masculine inanimate noun, its Accusative form looks exactly like the dictionary form.
The infinitive for "to wash" is мыть. Why is it мою here?
The verb мыть has a stem mutation in the present tense where an -о- appears. The stem becomes мо-, so "I wash" is я мою, "you wash" is ты моешь, and "they wash" is они моют.
Why is "hair" translated as the plural волосы instead of singular?
In English, "hair" is usually an uncountable singular noun, but in Russian, the hair on your head is plural (волосы). If you use the singular волос, it means just one single strand of hair!
Why does the second part of the sentence start with мне нужен instead of я?
Russian expresses "I need" by saying "is necessary to me." The person who needs something is put in the Dative case (мне), and the thing needed is the grammatical subject. So this literally translates to "A good shampoo is necessary to me."
How do we know to use the masculine words нужен and хороший with шампунь?
Nouns ending in a soft sign (-ь) can be either masculine or feminine, and you usually have to memorize which is which. Шампунь is a masculine noun, so it requires the masculine adjective хороший and the masculine short adjective нужен.

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