Commentaries:
Robertson's Word Pictures (NT)
Were looking steadfastly (atenizontev hsan). Periphrastic imperfect active of atenizw, a late intensive verb (intensive a and teinw, to stretch). Common in Acts and also in Luke 4:20; Luke 22:56 as well as Acts 10:4, which see.
As he went (poreuomenou autou). Genitive absolute of present middle participle. They saw him slipping away from their eyes as the cloud bore him away.
Stood by them (pareisthkeisan autoiv). Past perfect active indicative of paristhmi and intransitive (note i in B instead of ei for augment, mere itacism).
Other Robertson's Word Pictures (NT) entries containing Acts 1:10:
Mark 16:19
John 20:21
Acts 1:3
Acts 3:4
Acts 14:9
Acts 23:1
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