Verb tense. Choose the correct tense for each verb.

1. Previous work [3] to show the limitations of the two protocols.
2. English, Japanese, German, Korean an Greek to be some of the languages for which complete ToBI system descriptions exist [8].
3. Recently, several different multipath routing protocols based on DSR or AODV to propose. Lee and Gerla to propose Split Multipath Routing (SMR) [5].