在国际贸易和商业活动中，清晰、准确的发票是确保交易顺利进行的重要文件之一。英文形式的发票尤其适用于跨国贸易，因为它能帮助买卖双方快速理解交易细节，避免因语言障碍导致的误解。下面提供一个简单而实用的英文形式发票模板，供您参考。

INVOICE

Invoice No.: [Insert Invoice Number]

Date: [Insert Date]

Seller: [Insert Seller's Name and Address]

Buyer: [Insert Buyer's Name and Address]

Item Description:

[Insert Item Description]

Quantity: [Insert Quantity]

Unit Price (USD): [Insert Unit Price]

Total Amount (USD): [Insert Total Amount]

Terms of Payment:

[Insert Payment Terms, e.g., "Net 30 days", "30% advance payment, balance before shipment"]

Shipping Method:

[Insert Shipping Method, e.g., "By air", "By sea"]

Port of Loading: [Insert Port of Loading]

Port of Destination: [Insert Port of Destination]

Additional Notes:

[Insert Any Additional Notes or Instructions]

Signature:

_________________________

[Insert Seller's Signature]

这个模板可以根据具体需求进行调整和修改。例如，您可以根据交易的具体情况添加更多细节，如产品规格、税率、运输保险等信息。此外，在实际使用中，确保所有信息都准确无误是非常重要的，这不仅能提高交易效率，还能有效减少潜在的法律风险。

希望这份英文形式发票模板能够为您的国际贸易活动提供便利！