он, должен быть, не получил ответа.

он, должен быть, не получил ответа.
должно быть, денег за работу они не получили.

Результаты (английский) 1:

It has to be, has not received a response.There must be money for work they did not receive.

Результаты (английский) 2:

it must be received no reply.
must have the money for the work they have not received.

Результаты (английский) 3:

It should be, has not received a response.
should be, money for the work they had not received.