He can answer the question however hard it is.不管問題有多難他都能回答。
However did you get here?你是怎麼到這裡來的?
He hasn"t arrived. He may, however, come later.他還未到，不過，他可能過一會兒來。
"I"d like to go with you; however, my hands are full."
"我很想和你一塊兒去,可是我忙不過來。"
nevertheless（可做副詞，也可做連詞）。例句：
She was very tired, nevertheless she kept on working.她雖然很疲倦，可仍在繼續工作。
He"s stupid, but I like him nevertheless.他是很笨，然而我喜歡他。
nonetheless（只可做副詞）（亦作： none the less）=Nevertheless; however.仍然；不過
Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.
三個詞語意思相同，均表示：無論如何；不管怎樣（接副詞或形容詞）；然而；可是。三者基本可以通用。
however的內涵更多，用法更靈活,nevertheless使用使用範圍較窄.
however（可做副詞，也可做連詞），例句：
He can answer the question however hard it is.不管問題有多難他都能回答。
However did you get here?你是怎麼到這裡來的?
He hasn"t arrived. He may, however, come later.他還未到，不過，他可能過一會兒來。
"I"d like to go with you; however, my hands are full."
"我很想和你一塊兒去,可是我忙不過來。"
nevertheless（可做副詞，也可做連詞）。例句：
She was very tired, nevertheless she kept on working.她雖然很疲倦，可仍在繼續工作。
He"s stupid, but I like him nevertheless.他是很笨，然而我喜歡他。
nonetheless（只可做副詞）（亦作： none the less）=Nevertheless; however.仍然；不過
Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.
儘管模仿鳥學很多種鳥的鳴叫聲惟妙惟肖，但人類還是能夠依其聲音上的線索很快識別它們。