"If he did not walk, he would not see the animals"
Translation:Asingetembea asingeona wanyama
English uses the past tense with "if" to indicate a hypothetical situation (technically the past subjunctive, but that's only noticeable if the verb is "be" with the change from "was" to "were", which is also falling out of use). In the main clause of the sentence, "would" is used. Swahili uses -nge- for both of these. The meaning is not past - it's hypothetical.