No, that is indeed not the right structure; you seem to be confused yourself. There are several future forms in English, and two of them are 'will' and 'be going to'; hence, you cannot use both together. You can use these: He's going to swim/run -- A statement of future intention or plan He will swim/run -- A statement of future fact He will be swimming/running -- A statement of future fact with added interest on the part of the speaker He's going to be swimming/running -- A statement of future intention or plan with added interest on the part of the speaker
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