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Mr. Schar (be) ……... usually in the office on Tuesdays and Thursdays

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First, what is your answer, Desk Guava?

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desk guava 589

Mr. Schar (be) ……... usually in the office on Tuesdays and Thursdays

desk guava 589

Mr. Schar arrives usually in the office on Tuesdays and Thursdays

Mr. Schar (be) is usually in the office on Tuesdays and Thursdays

or Mr. Schar (be) was usually in the office on Tuesdays and Thursdays.

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Both is and was are possible.

Will be
Will be
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anonymous Will be

No. "Will be usually in the office" is not natural. Everybody would say "Will usually be in the office".