a) Which sentences can B (begin) and which can E (end) an email?

The sentences that can be used to *begin* an email are usually more conversational and aim to start a dialogue. The sentences used to *end* an email are more about concluding the communication. Let's analyze the given options: 1. "That's all for now." - This sentence is typically used to *end* an email. It indicates that the writer has finished their message and is ready to conclude the communication. 2. "Great to hear from you." - This sentence is typically used to *begin* an email, especially if it is a reply. It shows that the writer is pleased to receive communication from the recipient. 3. "Drop me a line." - This sentence is typically used to *end* an email, asking the recipient to write back. It's a friendly way to invite further conversation. Therefore: Sentences that can *begin* an email: "Great to hear from you." Sentences that can *end* an email: "That's all for now." and "Drop me a line."