a. 2 Sing.—λῦε, λίπε, τίθει (for τίθε-ε) have not lost -θι. -θι is found in 2 aor. pass. φάνη-θι; in στῆ-θι and ἕστα-θι; in some 2 aorists, like γνῶ-θι, τλῆ-θι, πῖ-θι, which are μι forms though they have presents of the ω form ( cross687). Also in ἴς-θι
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].