The phrase "a number of activities have been" is correct and usable in written English.
It can be used when discussing multiple activities that have occurred or been completed in the past.
Example: "A number of activities have been organized to promote community engagement this summer."
Alternatives: "several activities have been" or "various activities have been".
A number of activities have been completed and new ones have been launched.
Although a number of activities have been predicted but specifically anti-inflammatory, antiradical, anti-diabetic activities have been experimentally validated which proves that theoretical predictions agree with the experimental results.
DealBook » Occupy Wall Street's Birthday Party | A number of activities have been planned to mark the first anniversary of the Occupy Wall Street movement on Monday, with protesters looking to highlight home foreclosures and the type of speculation that caused JPMorgan Chase's multibillion-dollar trading loss, The New York Times reports.
Since then, a number of activities have been implemented in partnership with the responsible Ministries and UNICEF.
Within this context, a number of activities have been carried out in cooperation with FAO teams, (sub -regional officesub -regional Natiofficesironmentherogramme (United Nations Environment Programme
A number of activities have been initiated during the first year of the project's implementation, the final results of which will be a reduction in the number of institutions and placement capacities therein, enhancement of the quality of work, and transformation of the remaining capacities into services aligned with the needs of the local community or region where the institutions are located.
In addition to catalyzing acyl transfer reactions, a number of promiscuous activities have been described recently.
Once the programme of activity has been decided we hope to make a number of cross-party recommendations and highlight examples of best practice.
Maxwell's religious beliefs and related activities have been the focus of a number of papers.
A number of Solanum species with antileishmanial activity have been reported [ 24– 28].
A number of propolis preparations, showing biological activity, have been obtained through organic solvent extraction.
