alternately

With two things happening one after the other, repeatedly.

• The light flashed alternately red and blue.
• They worked alternately, each taking an hour.
• She was alternately hopeful and afraid.

How to use it: alternately A and B (The room was alternately quiet and noisy.)

Similar words: in turn, by turns

Common phrases: alternately hot, alternately red, alternately with someone

As another possible choice.

• Take the bus; alternately, you could walk.
• We can meet today or, alternately, tomorrow.
• Use butter; alternately, try a little oil.

Similar words: alternatively, instead

Common phrases: alternately try, alternately use, or alternately

By comparing the first terms of two equal ratios, then their second terms.

• The ratios can be compared alternately.
• Taken alternately, these terms give another equal pair of ratios.
• The proof uses the proportions alternately.

Common phrases: taken alternately, compared alternately