I think that in order to achieve a sense of community between your students you have to give them diverse and frequent opportunities for interaction between them and with you, it is not about knowing each other and working in groups in some activity, you have to interact a lot with all your classmates to build a community and feel that you belong to the class. So you have to design diverse activities and spaces for interaction, sharing and communication between students and with you. Also, you have to teach and guide the students in how to interact, how to contribute, how to add knowledge to the conversation, how to give their classmates feedback, how to reinforce their opinions, how to support them, how to answer their questions, how to evaluate them, how to question them, how to agree or refute them, how to make a comfortable climate for learning and a lot of other things related to create a sense of teaching presence and a sense of belonging to the group.