This is about the recent US Mars landing.
How did they make sure the rover landed/lands only on a flat terrain?
Is it lands or landed which is correct?
BulbulTada Is it lands or landed which is correct? Neither. They made sure it would land there.
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BulbulTadaIs it lands or landed which is correct?
Neither. They made sure it would land there. By the way, "terrain" is non-count there and takes no article.
1) How will they make sure the rover lands only on a flat terrain?
2) How did they make sure the rover landed only on a flat terrain?
3) How did they make sure the rover lands only on a flat terrain?
(1) and (2) are the most obvious tense combinations (other possibilities exist). (3) seems an unlikely thing to want to