Trademarks can usually be used during the trademark registration process. The specific circumstances are as follows:

1. Use of trademarks for commercial activities: Submission of a trademark registration application does not affect the use of the trademark. During the trademark registration process, you can usually continue to use the trademark in commercial activities, including identifying the trademark on products, using the trademark in promotional materials, etc.

2. Trademark use as evidence: The actual use of a trademark can be used as supporting evidence for a trademark registration application. The trademark registration authority may require evidence of trademark use to prove that the trademark has been used in commercial activities.

3. Continuity of trademark use: Trademark registration applications usually require continuous use of the trademark. During the trademark registration process, you need to ensure the continued use of your trademark to meet the requirements of the trademark registration authority.

Please note that the use of trademarks during the trademark registration process should comply with relevant laws and regulations. Specific trademark usage regulations may vary from country to country. It is recommended that during the trademark registration process, you follow the trademark laws of your country/region and the guidelines of the trademark registration authority, and consult a professional lawyer or trademark agent for accurate information and guidance.

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