Fine-Grained Sentiment Recognition Model for English Writing Texts Based on BERT-CNN-BiGRU

English writing texts often show complex semantic layers, implicit emotional expression, and strong temporal dependence, which leads to limitations in semantic modeling and restricted feature extraction in existing methods. To address this issue, the study constructed a fine-grained sentiment recognition model that integrates bidirectional encoder representations from transformers (BERT), bidirectional gated recurrent unit (BiGRU), convolutional neural network (CNN), and an attention mechanism. BERT was used to generate context-aware semantic representations and improve overall semantic understanding of the text. BiGRU was applied to capture bidirectional temporal dependencies and describe the dynamic evolution of emotions in discourse. CNN was employed to extract phrase-level local emotional features and enhance the detection of emotion-triggering segments. The attention mechanism was introduced to highlight key emotional information and improve feature discriminability. On this basis, a gating fusion strategy was used to dynamically integrate multi-source features, and a multi-task learning framework was incorporated. The model performed emotion intensity prediction while conducting multi-class emotion classification. In this way, fine-grained sentiment modeling was achieved from both category and intensity perspectives. The results indicate that the proposed model achieves excellent performance across several datasets, with overall accuracy and F1-score remaining above 91%, ROC-AUC reaching up to 0.944, and recognition rates for all emotion categories staying above 84%, clearly outperforming existing mainstream approaches. Ablation results demonstrated that all six modules contributed to performance improvement. On the SST-2 and IMDB datasets, the complete model achieved an accuracy of 93% and an AUC of 0.97. In summary, this research offers a compact, stable, and adaptable solution for emotion modeling in English texts, with both theoretical and practical value.