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そうしないと
1. otherwise, if not, or else
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乗り遅れる， 乗りおくれる， 乗遅れる， のりおくれる
1. to miss (a train, bus, etc.)
2. to fail to keep up with (e.g. the times), to be left behind by
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に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd