The following cmavo is discussed in this section:

All the information carried by the tense constructs so far presented has been presumed to be static: the bridi is occurring somewhere or other in space and time, more or less remote from the speaker. Suppose the truth of the bridi itself depends on the result of a movement, or represents an action being done while the speaker is moving? This too can be represented by the tense system, using the cmavo mo'i (of selma'o MOhI) plus a spatial direction and optional distance; the direction now refers to a direction of motion rather than a static direction from the speaker.

This is quite different from:

In either case, however, the reference frame for defining “right” and “left” is the speaker's, not the child's. This can be changed thus:

Example 10.37 is analogous to Example 10.35. The cmavo ma'i belongs to selma'o BAI (explained in Section 9.6), and allows specifying a reference frame.

Both a regular and a mo'i-flagged spatial tense can be combined, with the mo'i construct coming last:

It is not grammatical to use multiple directions like zu'a ca'u after mo'i, but complex movements can be expressed in a separate bridi.

Here is an example of a movement tense on a bridi not inherently involving movement:

(Perhaps I am eating in an airplane.)

There is no parallel facility in Lojban at present for expressing movement in time – time travel – but one could be added easily if it ever becomes useful.