As I work on the content of the product, he is calling the software companies.
Are the tenses used incorrectly?
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I believe the construction to be correct. It may be recast as one of the following:
“As I am working ... he is calling ...”
“As I work ... he calls ...”
“As I am working ... he calls ...”
The meanings of all four possibilities are clear and identical in describing the state and actions of the two people.
This is not to say that “I work” is the same as “I am working”. Both may be taken as general statement describing a person’s role in life (I run, I climb, I dive, I smoke, I paint, etc) or as descriptions of a more specific time, as in the given example.
As I work on the content of the product, he is calling the software companies Are the tenses used incorrectly?
Yes, if you rewrite the sentences like this they will work
As I work on the content of the product, he calls the software companies
As I am working on the content of the product, he is calling the software companies
The original sentence mixes simple present with the present continuous (also the present progressive).
The Present progressive tense is formed by adding -ing to the base verb. grammargeek/