Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-tendo, di, sum, and tum, 3, v. a., and n.
Prop., to stretch out, extend   hence, transf., 
- * I.  Act., to carry out, go on with, perform any thing: video non licere ut coeperam hoc pertendere, Ter. Heaut. 5, 5, 9.
 
- II.  Neutr. 
 
- A.  Prop., to strive forward, to push on to a place; hence, to go right on, proceed to (not in Cic. or Cæs.; ap. Cic. Balb. 5, 11, the correct reading is perpendemus): pars maxima Romam pertenderunt, Liv. 5, 8: pertendit ad alteram ripam, Suet. Caes. 32; id. Vit. Plin.; id. Caes. 4.
 
- B.  Trop., to keep on, persevere, persist: verum si incipies, neque pertendes naviter, Ter. Eun. 1, 1, 6: a qua re sit pertinacia quom quaeritur, ostenditur esse a pertendendo  …  in quo non debet pertendi, etc., Varr. L. L. 5, § 2 Müll.; Prop. 2, 15 (3, 7), 17.
 
- C.  To attend, be attentive (late Lat.), Laurent. Hom. 1.