その件について調べておかなければならない。の英語

We have to study the matter.

You should look into the matter at once.

You should look into the matter right away.

You should look into the matter immediately.

We need to talk about this.

We intend to look into that matter.

The matter must be thoroughly investigated―probed to the bottom.

This matter needs investigation.

I need to confirm several points in regards to that.

We have to settle this matter once and for all.

We must probe the matter to the bottom.

Something needs to [should] be said about it.

More confirmation is needed for that.

No time should be lost in looking into the problem.

I need to confirm about that.

I need to consider that separately.

We must take the circumstances into account

Circumstances alter cases.

We must discuss the matter to a conclusion.

We need to dig a bit deeper into the matter.

The matter needs further investigation.

I need to think about that.

We must make allowances according to circumstances―（他動詞構文にすれば）―Circumstances alter cases.

There are extenuating circumstances.

You should consider the problem.

This problem needs serious consideration.

The story must be taken with some （grains of） allowance―taken with a grain of salt.

This is a matter for our consideration.

That's something to think about.

The matter must be investigated―inquired into.