1) The project deadline is tight, but still doable if we work efficiently.

2) Running a marathon seemed daunting at first, but with sufficient training, it became doable.

3) The instructions for assembling the furniture were clear and doable.

4) With a bit of practice, solving complex math problems became more doable.

5) Cleaning the entire house in one day is doable if we all pitch in.

6) Breaking the bad habit of biting nails is challenging but doable with determination.

7) Planning a last-minute trip is doable if you are flexible with your schedule.

8) Learning a new language can be overwhelming, but breaking it down into smaller tasks makes it more doable.

9) Completing the 1000-piece puzzle may take time, but it is definitely doable.

10) Adhering to a strict diet plan is challenging, but with support and determination, it is doable.