明日雨降りなら、家にいます。
tbd
If it rains tomorrow, I'll stay home.
I will stay home if it rains tomorrow.
I'll stay home if it rains tomorrow.
I'll stay at home if it rains tomorrow.
If it's raining tomorrow, I'll stay home.
家， いえ
1. house, residence, dwelling
2. family, household
3. lineage, family name
房子，住宅；家；家族
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