1. ～がてら
V ます + がてら
Explanation: Expresses taking the opportunity provided by doing A to also do B: “while doing A / on the occasion of A, also do B.” A provides the occasion and B is an additional action carried out at the same time. It often occurs with activities such as 散歩, 買い物, and お見舞い, or with verb stems such as 行きがてら. It should not be understood as being restricted only to activities involving going out; the key idea is using A as an opportunity to do B as well.
2. ～かたがた
Explanation: Describes doing one thing so that two purposes are achieved at the same time. This pattern is much more formal and polite than ～がてら.
✓ The following clause often uses movement verbs used to accomplish the purpose, such as 行く (go) and 伺う / 訪ねる (visit).
✓ It is common in letters, business communication, and formal greetings, for example when visiting both to report something and to pay one's respects.
3. ～かたわら（傍ら）
Vる (Dictionary form) + かたわら
Explanation: Means that alongside maintaining one's main activity, such as a profession or specialized job, one also carries out another activity or role in parallel.
✓ It often appears with words referring to one's main occupation. The second clause describes a social activity or side job continued over a long period. It is NOT used for brief simultaneous actions such as “eating while watching TV.”
