YOU SAID:

how about we dont and say that we did

INTO JAPANESE

いけないと言って私たちがやったと言う

BACK INTO ENGLISH

Say that we did it by saying that we should not

INTO JAPANESE

してはいけないと言ってそれをしたと言う

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Say that you said you should not do it

INTO JAPANESE

してはいけないと言ったとしましょう

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Let's say you should not do it

INTO JAPANESE

してはいけないとしましょう

BACK INTO ENGLISH

Let's say you can not

INTO JAPANESE

できないとしましょう

BACK INTO ENGLISH

Let's say that we can not do it

INTO JAPANESE

できないとしましょう

BACK INTO ENGLISH

Let's say that we can not do it