A.T. Robertson Commentary John 6:2

"And a great multitude followed him, because they beheld the signs which he did on them that were sick." — John 6:2 (ASV)

Followed (ηκολουθε). Descriptive imperfect active, picturing the crowd, but without the details of the boat for Christ and the rapid race of the crowd on foot (Mr 6:32f.; Matthew 14:13f.).

They beheld (εθεωρουν). Imperfect active of θεωρεω. They had been beholding the signs which Jesus had been doing (εποιε, imperfect again) for a long time (2:23), most of which John has not given (Mr 1:29f.; 2:1; 3:1; 6:5). The people were eager to hear Jesus again (Luke 9:11) and to get the benefit of his healing power "on them that were sick" (επ των ασθενουντων, the weak or feeble, without strength, α privative and σθενος, strength).