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Learn school subject vocabulary, classroom objects, and how to give opinions about school using 因为 and 很.
In Mandarin, adjectives can act as the predicate of a sentence without needing the verb 'to be'. A word such as 很 (hěn, 'very') is usually placed before the adjective, even when the meaning is not strongly 'very' — it simply links the subject to the adjective. For example: 数学很难 (shùxué hěn nán) — 'Maths is difficult'. Do not add 是 before the adjective (数学是难 is incorrect).
To explain why you like or dislike a subject, use 因为 (yīnwèi, 'because') after stating your opinion with 喜欢 (xǐhuan, 'to like'). For example: 我喜欢科学,因为很有意思 (wǒ xǐhuan kēxué, yīnwèi hěn yǒu yìsi) — 'I like science because it's interesting'. For a negative opinion, add 不 before 喜欢: 我不喜欢历史,因为很难 (wǒ bù xǐhuan lìshǐ, yīnwèi hěn nán) — 'I don't like history because it's difficult'.