The Lojban tense system interacts with the Lojban logical connective system. That system is a separate topic, explained in Chapter 14 and touched on only in summary here. By the rules of the logical connective system, Example 10.117 through Example 10.119 are equivalent in meaning:

Suppose we wish to add a tense relationship to the logical connective “and” ? To say that Terry strokes the cat and later strokes the rabbit, we can combine a logical connective with a tense connective by placing the logical connective first, then the tense, and then the cmavo bo , thus:

Example 10.120 through Example 10.122 are equivalent in meaning. They are also analogous to Example 10.117 through Example 10.119 respectively. The bo is required for the same reason as in Example 10.110 : to prevent the ba from functioning as a sumtcita for the following sumti (or, in Example 10.121 , from being attached to the following selbri).

In addition to the bo construction of Example 10.120 through Example 10.122 , there is also a form of tensed logical connective with ke … ke'e ( tu'e … tu'u for sentences). The logical connective system makes Example 10.123 through Example 10.125 equivalent in meaning:

Note the uniformity of the Lojban, as contrasted with the variety of ways in which the English provides for the correct grouping. In all cases, the meaning is that I carry the sack in any case, and either the cat or the dog or both.

To express that I carry the sack first (earlier in time), and then the dog or the cat or both simultaneously, I can insert tenses to form Example 10.126 through Example 10.128 :

Example 10.126 through Example 10.128 are equivalent in meaning to each other, and correspond to the tenseless Example 10.123 through Example 10.125 respectively.