Markus 9:21

9:21 Jesus ¹  asked his father, “How long has this been happening to him?” And he said, “From childhood.

Markus 13:29

13:29 So also you, when you see these things happening, know ²  that he is near, right at the door.

[9:21]  ¹ tn Grk “He”; the referent (Jesus) has been specified in the translation for clarity.

[13:29]  ² tn The verb γινώσκετε (ginwskete, “know”) can be parsed as either present indicative or present imperative. In this context the imperative fits better, since the movement is from analogy (trees and seasons) to the future (the signs of the coming of the kingdom) and since the emphasis is on preparation for this event.