My Writing practice

I will try to make some sentences for my practice.

- The proffessor professor revealed that the former theory is not right any more.
(this sentence is good and correct but the meaning should likely be "The professor revealed that a former theory is not right any more" or "A professor revealed that the former theory is not right any more"

Moreover, it is better to use "valid" or "invalid" to describe a theory, though right is acceptable.

)

- In Japan, people's expected longevity is relatively long.

(while longevity is already containing the meaning of "long life", you can simply say "people are expected to have relatively high longevity." or "people's expected life is relatively long". it is just for your information, "long longevity" is also acceptable)

- Speaking pace might be an indicator of their intelligence.

- Let's go shopping in tandem.

How did I do?

You did great and I think you are a thoughtful learner.