(3) is also correct; it is a formal way of writing (1) (albeit "We're" is informal, so potentially there is a slight mismatch there). In everyday language many people would use (1) instead of (3). (2) is also fine.
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(3) is also correct; it is a formal way of writing (1) (albeit "We're" is informal, so potentially there is a slight mismatch there). In everyday language many people would use (1) instead of (3). (2) is also fine.