じゃなく、じゃなくて、じゃなくては、ではなく、ではなくて、ではなくては


Which of the above are acceptable in the following construction?

彼氏は料理だけ＿＿＿＿、家事も出来る。

What I am confused about is which of the constructions are grammatical and
which are not? I have used じゃなくては in the past without correction, but when
using the more formal form ではなく, it seems as though て form is not used at all,
and is in fact wrong.




> 「彼氏{かれし}は料理{りょうり}だけ＿＿＿＿、家事{かじ}も出来{でき}る。」

The key words in this incomplete sentence are 「だけ」 and 「も」.

Almost only by seeing the two tiniest kana words, we know right away that we
are dealing with a " **not only A but also B** " type of sentence pattern
here.

> "My (partner) can not only cook but he can also do the household chores."

The phrases that can safely fit into that empty spot must be in the forms of:

では **なく** and では **なくて** less informally and

じゃ **なく** and じゃ **なくて** informally.

(For each pair, the 「て」 makes it one step more informal than without.)

Basically, no other phrases would fit in either grammatically or contextually.
Neither 「じゃなくて **は** 」 nor 「ではなくて **は** 」 would belong there. There is simply
no reason that the final 「は」 is needed.

「なくて **は** 」 is most often used in negative conditional/hypothetical
constructs such as:

「君がいなくて **は** 生きていけない。」 ("I can't live without you.")

「日本に来たら京都に行かなくてはならない。」 ("If you come to Japan, you've got to go to Kyoto.")




> 「彼氏{かれし}は料理{りょうり}だけ＿＿＿＿、家事{かじ}も出来{でき}る。」

The key words in this incomplete sentence are 「だけ」 and 「も」.

Almost only by seeing the two tiniest kana words, we know right away that we
are dealing with a " **not only A but also B** " type of sentence pattern
here.

> "My (partner) can not only cook but he can also do the household chores."

The phrases that can safely fit into that empty spot must be in the forms of:

では **なく** and では **なくて** less informally and

じゃ **なく** and じゃ **なくて** informally.

(For each pair, the 「て」 makes it one step more informal than without.)

Basically, no other phrases would fit in either grammatically or contextually.
Neither 「じゃなくて **は** 」 nor 「ではなくて **は** 」 would belong there. There is simply
no reason that the final 「は」 is needed.

「なくて **は** 」 is most often used in negative conditional/hypothetical
constructs such as:

「君がいなくて **は** 生きていけない。」 ("I can't live without you.")

「日本に来たら京都に行かなくてはならない。」 ("If you come to Japan, you've got to go to Kyoto.")

